21/80=7/8a

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Solution for 21/80=7/8a equation: 


a in (-oo:+oo)

21/80 = (7/8)*a // - (7/8)*a

21/80-((7/8)*a) = 0

(-7/8)*a+21/80 = 0

21/80-7/8*a = 0 // - 21/80

-7/8*a = -21/80 // : -7/8

a = -21/80/(-7/8)

a = 3/10

a = 3/10

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