Question

solving for one variable in terms of others.
Solve for a: y= x (ab)/(a-b)

Answer 1

Well:

y=xab/(a-b)
y(a-b)=xab
ya-yb=xab
ya=xab+yb
ya-xab=yb
a(y-xb)=yb
a=(yb)/(y-xb)

Answer 2

thank you!