-x/2=21

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Solution for -x/2=21 equation: 


x in (-oo:+oo)

-x/2 = 21 // - 21

-x/2-21 = 0

-1/2*x-21 = 0 // + 21

-1/2*x = 21 // : -1/2

x = 21/(-1/2)

x = -42

x = -42

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