6a=(5(3+b+a)-9, find value of a; 3(a-b)+4b=5(1+6), find value of b

3 answers

Parentheses come in pairs. You have two left parentheses and one right parenthesis, so I do not know what you mean.
Solve by substitution:

6a=5(3+b+a)-a; find value of a
3(a-b)+4b=5(1+b); find value of b
Solve by substitution:

6a=5(3+b+a)-a; find value of a
3(a-b)+4b=5(1+b); find value of b