Sagot :
A = 2(3a + 4) - 4(2a - 3)
A = 6a + 8 - 8a + 12
A = -2a + 20
B = (3a - 5) - 2(1 - 2a) + 3(-a - 4)
B = 3a - 5 - 2 + 4a - 3a - 12
B = 4a - 19
3(x - 7) + 4(x + 2) = 5(2x - 1) - 2(1 - x)
3x - 7 + 4x + 8 = 10x - 5 - 2 + x
7x + 1 - 11x = 11x - 7 - 11x
-4x + 1 - 1 = -7 - 1
-4x / -4 = -8 / -4
x = 2
2x - 4 = -2
3
2x - 4 *3 = -2
3
2x - 4 + 4 = - 2 + 4
2x / 2 = 2 / 2
x = 1