12 4(2x - 5) + 12 = 3(2 + 3x) 8x - 20 + 12 = 6 + 9x 8x - 8 = 6 + 9x 9x - 8x = -8 - 6 x = -14

1)124(2x - 5) + 12 = 8(31x-76)

2)3(2 + 3x) 8x - 20 + 12 = 8(6x+9x²-1)

3)6 + 9x 8x - 8 = -2(1-6x)·(1=6x)