0.5y - 14 = -29+0.8y
0.5y-0.8y=-29+14
-0.3y=-15
y=50
3(6 - 5x) + 17x - 10 = 18 - 15x + 17x - 10 = (17x - 15x) + (18 - 10) = 2x + 8
Ответ : 2x + 8