$x = 0, -4$
Work Step by Step
$3x^2 = -12x $ $3x^2 + 12x = -12x + 12x$ $3x^2 +12x = 0$ $3x (x+4) = 0$ Therefore $3x = 0$ $x= 0$ OR $x+4 = 0$ $x=-4$
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