3-y+2(5-y)=4y-8 чему равно y?

Question

3-y+2(5-y)=4y-8 чему равно y?

Answer 1

3-y+2(5-y)=4y-8 
3 - y +10 -2y +8 = 4y
21 = 4y +3y
21 = 7y
y = 21/7 = 3

Answer 2

3-у+10-2у=4у-8
13-3у=4у-8
-7у=-21
у=21:7
у=3