Question

4(x+1)=12
5(3-x)-4x=18
9x-3(2x+2)=15
2,5(x-2)-1,5x=1
3,5x+8=2(x+7)
6(3x+2)-8=-2
-3(x-5)-2(2x+1)=-8

Answer 1

1 --> 4(x+1)=12
2 --> 5(3-x)-4x=18
3 --> 9x-3(2x+2)=15
4 --> 2,5(x-2)-1,5x=1
5 --> 3,5x+8=2(x+7)
6 --> 6(3x+2)-8=-2
7 --> 3(x-5)-2(2x+1)=-8

1 --> 4x + 4 =12 --> 4x =  8  --> x = 8/4 --> x = 2

2 --> 15 - 5x - 4x = 18 --> -9x = 3 --> x = 3/-9 simplificando = 1/-3

3 --> 9x-3(2x+2)=15 --> 9x -6x -6 = 15 --> 3x = 21 --> x = 7

4 --> 2,5(x-2)-1,5x=1 --> 2,5x -5 -1,5x = 1 --> x = 6

5 --> 3,5x + 8=2(x+7) --> 3,5x + 8 = 2x +14 --> 1,5x  = 6 --> x = 4

6 --> 6(3x+2)-8=-2 --> 18x +12 -8 = -2 --> 18x = -6 --> x = -6/18 simplificando = -1/3 

7 --> 3(x-5)-2(2x+1)=-8 --> 3x -15 -4x -2 = -8 --> -x = 9 (Faz vezes -1 para deixar o x positivo) = x = -9