x - 7 ÷ X² - 10x + 21
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x2+10x+21=0 x2+(7x+3x)+21 =0 x2+7x+3x+21=0 x(x+7)+3(x+7)=0 (x+3)(x+7 )=0 x+7=0. x+3=0 x=-7. x=-3.
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