-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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