7(Y+3)-2(Y+2)=2(5Y+1)
7у+21-2у-4=10у+2
7у-2у-20у=-21+4+2
-5у=-15
у=3
7y+21-2y-4=10y+2
7y-2y-10y=2+4-21
-5y=-15
y=3
7(Y+3)-2(Y+2)=2(5Y+1)
7у+21-2у-4=10у+2
7у-2у-20у=-21+4+2
-5у=-15
у=3
7y+21-2y-4=10y+2
7y-2y-10y=2+4-21
-5y=-15
y=3