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

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

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

y = -21/7/8

y = -24

y = -24

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