Answer
$\frac{7}{9}$
Work Step by Step
The given expression is
$=\frac{a-b}{3a+b}$
Substitute $4$ for $a$ and $-3$ for $b$.
$=\frac{4-(-3)}{3(4)+(-3)}$
Simplify.
$=\frac{4+3}{12-3}$
$=\frac{7}{9}$
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