$x=9$ or $x=-7$
Work Step by Step
$x^2-2x-63=0$ $x^2+7x-9x-63=0$ $x(x+7)-9(x+7)=0$ $(x-9)(x+7)=0$ $x-9=0$ or $x+7=0$ $x=9$ or $x=-7$
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