-4/7=y/21

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Solution for -4/7=y/21 equation: 


y in (-oo:+oo)

-4/7 = y/21 // - y/21

-(y/21)-4/7 = 0

-1/21*y-4/7 = 0 // + 4/7

-1/21*y = 4/7 // : -1/21

y = 4/7/(-1/21)

y = -12

y = -12

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