(4.5y+9)-(6.2-3.1y)=7.2y+2.8

Question

(4.5y+9)-(6.2-3.1y)=7.2y+2.8

Answer 1

1.4y-7.2y=2.8-2.8
-5.8y=0
y=0

Answer 2

Ответ о
(4,5у+9)-(6,2-3,1у)=7,2у+2,8
4,5у+9-6,2+3,1у=7,2у+2,8
4,5у+3,1у-7,2у=2,8-9+6,2
0,4у=0
у=0:0,4
у=0