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Solve by factoring

x^2 -12x +20=0

Looking for two numbers whose sum is -12 and product is +20

Those two numbers are -10 and -2

Therefore

x^2-10x-2x+20=0

x(x-10)-2(x-10)=0

(x-2)=0 imply x=2

(x-10)=0 imply x=10

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