6y-20=2(5y-10)=-4 помогите

Question

6y-20=2(5y-10)=-4 помогите

Comments

там точно ...=-4?

Answer 1

6y-20=2(5y-10)-4
6y-20=10y-20-4
6y-10y=-24+20
-4y=-4
y=1