Question 95429
Multiply a+b times both sides. n=(a+b)(c-n)
n=ac-an+bc-bn
add an+bn to both sides. n+an+bn=ac+bc
factor n(1+a+b)=c(a+b)
divide 1+a+b into both sides.
{{{n=c(a+b)/(1+a+b)}}}
EdJones