Question

у²-3(у-5)+у(4-у)+5у=10у+7

Answer 1

y^2-3y+15+4y-y^2+5y=10y+7
-3y+4y+5y-10y=7-15
-4y=-8
y=8/4
y=2

Answer 2

у² - 3*(у-5) + у*(4-у) + 5у = 10у + 7
у² - 3у + 15 + 4у - у² + 5у - 10у = 7
-4у = 7 - 15
-4у = -8
у = 2