Question 330150
{{{x/3=4/(x+1)}}}
Multiply both sides by {{{3(x+1)}}}.
{{{x(x+1)=12}}}
{{{x^2+x-12=0}}}
{{{(x+4)(x-3)=0}}}
Two solutions:
{{{x+4=0}}}
{{{highlight(x=-4)}}}
.
.
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{{{x-3=0}}}
{{{highlight(x=3)}}}