A) 5(x+4) = 2(4x-5)
5x + 20 = 8x - 10
20 + 10 = 8x - 5x
30 = 3x
x = 10

B) x + 2 = 5x - 2(x-3)
x + 2 = 5x - 2x + 6
x + 2 = 3x + 6
2 - 6 = 3x - x
-4 = 2x
x = -2

Ответы:
A) х = 10
B) х = -2