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2)x²+7x=18=> x²+7x-18=0 => (x+9)(x-2)=0
3)8x-65=-x² => x² +8x-65=0 => (x+13)(x-5)=0
4) x²=108-3x => x²+3x -108=0 => (x+12)(x-92)=0
LIsto , son todos!!!!!!