simplify:2x²+5x-1+8x+x²+7-6x+3-3x²
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===> 2x²+5x-1+8x+x²+7-6x+3-3x²
Solution
=2x²+5x-1+8x+x²+7-6x+3-3x²
=2x²+x²-3x²+5x-6x+8x-1+3+7
====>7x+9=0
7x=-9
x=-9/7
x=-1.285
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