-21=y/4

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Solution for -21=y/4 equation: 


y in (-oo:+oo)

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

-(y/4)-21 = 0

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

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

y = 21/(-1/4)

y = -84

y = -84

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