Question 200602
{{{x/3 = 4/(x +1)}}}
Cross multiplying we get:
{{{x(x +1) = 3*4}}}
{{{x^2+x = 12}}}
{{{x^2+x-12=0}}}
Factoring:
{{{(x+4)(x-3)=0}}}
x = {-4,3}