Question

m = cab/a-b what is the value of b ?

Answer 1

m=cab/a-b
(a-b)m=cab
ma-mb=cab
ma=mb+cab
ma=b(m+ca)
b=ma/m+ca

Answer 2

M = cab/a - b aM - bM = cab cab + bM = aM b(ca + M) = aM b = aM/ca + M