-21=x/3

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Solution for -21=x/3 equation: 


x in (-oo:+oo)

-21 = x/3 // - x/3

-(x/3)-21 = 0

-1/3*x-21 = 0 // + 21

-1/3*x = 21 // : -1/3

x = 21/(-1/3)

x = -63

x = -63

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