1、2x+8= 16，2x= 16-8，x=8÷2，x=4

2、x÷5= 10，x=5× 10，x=50

3、x+7x=8，8x=8，x=8÷8，x= 1

4、9x-3x=6，6x=6，x=6÷6，x= 1

5、6x-8=4，6x=8+4，x= 12÷6，x=2

6、5x+x=9，6x=9，x=9÷6，x= 1.5

7、8x-8=6x，8x-6x=8，2x=8，x=8÷2，x=4

8、40÷5x=20，5x=40÷20，x=2÷5，x=0.4

9、2x-6= 12，2x=6+ 12，2x= 18，x= 18÷2，x=9

10、7x+7= 14，7x= 14-7，x=7÷7，x= 1

The first grade mathematics is a one-dimensional linear equation with only one unknown number, the highest degree is 1, both sides are algebraic expression equations, and the one-dimensional linear equation has only one root.

Steps to solve the equation:

1, denominator first.

2. If there are brackets, remove them.

3. Move the project if necessary.

4. Merge similar projects.

5. The coefficient reaches 1 to get an unknown value.

6. Write "solution" at the beginning.

The basis of solving equations:

1, shift term symbols: move some terms in the equation from one side to the other, add the previous symbols, and add, subtract, multiply and divide.

2. Basic properties of the equation: adding (or subtracting) the same number or the same algebraic expression on both sides of the equation at the same time, the result is still an equation. Represented by letters: if a=b, c is a number or an algebraic expression.

When both sides of an equation are multiplied or divided by the same number that is not 0, the result is still an equation. Represented by letters: if a=b, c is a number or an algebraic expression (not 0).