Пошаговое объяснение:
3/7(5х-8) = -12
5x - 8 = -12 * 7/3
5x - 8 = -28
5x = -28+8
5x = -20
x = -20:5
x = -4
3/4(2у+1)+5=5,5
3/4(2y + 1) = 5,5 - 5
3/4(2y + 1) = 0,5
2y + 1 = 1/2 * 4/3
2y + 1 = 2/3
2y = 2/3 - 1
2y = -1/3
y = -1/3 * 1/2
y = -1/6
