1.2(x-2)-3(4x- 1)= 9( 1-x)？

2. 1 1x+64-2x = 100-9x？

3. 15-(8-5x)=7x+(4-3x)

4.3(x-7)-2[9-4(2-x)]=22？

5.3/2[2/3( 1/4x- 1)-2]-x = 2？

6.2(x-2)+2=x+ 1

7.0.4(x-0.2)+ 1.5=0.7x-0.38？

8.30x- 10( 10-x)= 100？

9.4(x+2)=5(x-2)

10. 120-4(x+5)=25？

1 1. 15x+863-65x=54？

12. 12.3(x-2)+ 1 = x-(2x- 1)

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, the basic properties of the equation:

Adding (or subtracting) the same number or the same algebraic expression on both sides of the (1) 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.

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