Answer
$\frac{15-20}{y-4}$=$\frac{-5}{y-4}$
Work Step by Step
$\frac{15}{y-4}$+$\frac{20}{4-y}$=
$\frac{15}{y-4}$+$\frac{20(-1)}{(4-y)(-1)}$=
$\frac{15}{y-4}$+$\frac{-20}{y-4}$=
$\frac{15-20}{y-4}$=$\frac{-5}{y-4}$
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