The solution to the problem is as follows:
5x^2 + 9x - 2 / x^2 + 12x + 20 multiply x^2 + 17x + 70 / 15x - 3
=[(5x-1)(x+2)]/[(x+2)(x+10)] multiply [(x+7)(x+10)]/[3(5x-1)]
=(x+7)/3
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