Question

-10+18=-3(5u-7)+5y
Please solve I want to check if I made any mistakes or if I did it wrong entirely

Answer 1

−15u+5y+21=8−15u+5y+21+−21=8+−21−15u+5y=−13
−15u+5y+−5y=−13+−5y−15u=−5y−13
−15u−15=−5y−13−15u=13y+1315

The answer should be u=1/3y+13/15