-3=x/21

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Solution for -3=x/21 equation: 


x in (-oo:+oo)

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

-(x/21)-3 = 0

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

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

x = 3/(-1/21)

x = -63

x = -63

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