21=7/8y

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Solution for 21=7/8y equation: 


y in (-oo:+oo)

21 = (7/8)*y // - (7/8)*y

21-((7/8)*y) = 0

(-7/8)*y+21 = 0

21-7/8*y = 0 // - 21

-7/8*y = -21 // : -7/8

y = -21/(-7/8)

y = 24

y = 24

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