Question

If a*b=ab+b-a then what is the value of c such that c*(2*5)=97?

Answer 1

so here is a question of binary operator
a*b=ab+b-a
c*(2*5)=c*(10+5-2)=c*(13)
c*13=13c+13-c=97
12c=97-13
12c=84
c=7