-3/7=p/21

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Solution for -3/7=p/21 equation: 


p in (-oo:+oo)

-3/7 = p/21 // - p/21

-(p/21)-3/7 = 0

-1/21*p-3/7 = 0 // + 3/7

-1/21*p = 3/7 // : -1/21

p = 3/7/(-1/21)

p = -9

p = -9

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