1, see if both sides of the equal sign can be calculated directly.

2. If the two sides can't be calculated directly, use the sum-difference product quotient formula to deform the equation.

3. Separate the items that can be added or subtracted.

4. Divide both sides by a nonzero number at the same time.

note:

(1), only items with unknowns can be added or subtracted, or only items without unknowns can be added or subtracted.

(2) Dividing by a number is equal to multiplying the reciprocal of this number.

Extended data

Application of Multiplicative Distribution Law

1, additive commutative law: a+b=b+a addition law: (a+b)+c=a+(b+c).

2. Multiplicative commutative law: a×b=b×a Multiplicative associative law: (a×b)×c=a×(b×c).

3. Multiplication distribution law: (a+b) × c = a× c+b× c.

4. The essence of subtraction: A-B-C = A-(B+C).

5. The nature of division: a÷b÷c=a÷(b×c).

(Note: After the brackets are removed, there is a minus sign in front of them. After removing the brackets, each item in the brackets should be changed into a minus sign, that is, the plus sign in the brackets should be changed into a plus sign. This is the nature of using subtraction),

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