Question

Решите уравнение пж
4-(y+7)*3= -5*(y-8)

Answer 1

4 - (y + 7) * 3 = -5 * (y - 8),
4 - 3у - 21 = -5у + 40,
-3у + 5у = 40 - 4 + 21,
2у = 57,
у = 57 / 2,
у = 28,5,

проверка:
4 - (28,5+7)*3 = -5(28,5-8),
4 - (35,5*3) = -142,5+40,
-102,5 = -102,5

Answer 2

4-3y-21=-5y+40
-17-3y=5y+40
-3y-5y=40+17
-8y=47
y=-5,875

Answer 3

40+17=57