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(8x²+6x²+3x-7) + (3x²+8x²+7x-8)

Group similar terms....

(8x²+6x²+3x²+8x²) + (3x+7x) + (-7-8)

= 25x²+10x-15

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(8x²+6x²+3x-7) + (3x²+8x²+7x-8) First remove the parenthesis before you remove the parenthesis solve each first =(8x²+6x²+3x-7) =14x²+3x-7 And the other one = (3x²+8x²+7x-8) =11x²+7x-8 And then after that you can solve now 14x²+3x-7 + 11x²+7x-8 = 25x²+10x15
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