Answer
$x = 0, -15$
Work Step by Step
We factor the expression, and then we set each factor equal to zero:
$15x = -x^{2}$
$15x + x^{2} = 0$
$x(15 + x) = 0$
First Factor:
$x=0$
Second Factor:
$x+15=0 \\\\ x=-15$
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