解方程3(x+5)²-2(x+2)²-(x+9)(x-9)=81
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解方程3(x+5)²-2(x+2)²-(x+9)(x-9)=81
解方程3(x+5)²-2(x+2)²-(x+9)(x-9)=81
解方程3(x+5)²-2(x+2)²-(x+9)(x-9)=81
3x²+30x+75-2x²-8x-8-x²+81=81
22x=67
x=67/22