= (6x²–7x+2)+(6x³–7x+15)
= 6x²–7x+2+6x³–7x+15
= 6x²–14x+17+6x³
= 6x³+6x²–14x+17
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Verified answer
= (6x²–7x+2)+(6x³–7x+15)
= 6x²–7x+2+6x³–7x+15
= 6x²–14x+17+6x³
= 6x³+6x²–14x+17