Answer
$16x^{2}-x-18$
Work Step by Step
$(14x^{2}-4x-6)-(-2x^{2}-3x+12)$
$=14x^{2}-4x-6+2x^{2}+3x-12$
$=14x^{2}+2x^{2}-4x+3x-6-12$
$=16x^{2}-x-18$
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