1/2(12-20)=x

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Solution for 1/2(12-20)=x equation: 


x in (-oo:+oo)

(1/2)*(12-20) = x // - x

(1/2)*(12-20)-x = 0

-x-4 = 0 // + 4

-x = 4 // * -1

x = -4

x = -4

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