1, estimation method: an introductory method when you are just learning to solve equations. Estimate the solution of the equation directly, and then substitute it into the original equation for verification.

2. Apply the properties of the equation to solve the equation.

3. Merge similar terms: transform the equation into a monomial.

4. Move terms: move terms containing unknown to the left and constant items to the right.

For example: 3+x= 18

Solution: x= 18-3

x= 15

5. Delete brackets: Use the rule of deleting brackets to delete brackets from the equation.

4x+2(79-x)= 192

Solution: 4x+ 158-2x= 192.

4x-2x+ 158= 192

2x+ 158= 192

2x= 192- 158

x= 17

Extended data:

Matters needing attention in solving equations:

1. An equation containing an unknown number is called an equation. It can also be said that an equation containing unknowns is an equation.

2. Holding the value of the unknown quantity of the equation is called the solution of the equation, or the root of the equation.

3. Solving the equation is the process of finding the values of all the unknowns in the equation.

4, the equation must be an equation, and the equation is not necessarily an equation. An equation without unknowns is not an equation.

5. Verification: After solving the equation, verification is needed. Verification is to substitute the unknown value into the original equation to see if both sides of the equation are equal. If they are equal, then the value obtained is the solution of the equation.

6. Note: Write the word "Xie", align the equal sign and check.

7, the equation depends on the relationship between the parts of the equation, and the relationship between addition, subtraction, multiplication and division (complement+complement = sum, and- one of the addends = another addend, difference+subtraction = minuend, minuend-difference = subtraction, factor × factor = product, product ÷ one factor = another.

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