-21=x/7

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Solution for -21=x/7 equation: 


x in (-oo:+oo)

-21 = x/7 // - x/7

-(x/7)-21 = 0

-1/7*x-21 = 0 // + 21

-1/7*x = 21 // : -1/7

x = 21/(-1/7)

x = -147

x = -147

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