Question

2/3у-1/3=5/9у
3/4у-2/3=7/12у

Answer 1

1) 2/3у-5/9у=-1/3;
Общ знамен 9у
6/9у-5/9у=-1/3
1/9у=-1/3;
У=-3

2) 3/4у-7/12у=2/3;
9/12у-7/12у=2/3;
2/12у=2/3; у=4