Question

3у(у-7)-(у+4)(3у-2)=3у+6

Answer 1

3y2-21y-(3y2-2y+12y-8)=3y-6
3y2-21y-(3y2+10y-8)=3y+6
3y2-21y-3y2-10y+8=3y+6
-31y+8=3y+6
-31y-3y=6-8
-31y=-2
y=2/34
y=1/17

Answer 2

Спасибо