Answer
$-2x^{2}+11x-19$
Work Step by Step
$(6x^{2}+8x-14)-(8x^{2}-3x+5)$
=$6x^{2}+8x-14-8x^{2}+3x-5$
=$6x^{2}-8x^{2}+8x+3x-5-14$
=$-2x^{2}+11x-19$
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