21=7/3y

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Solution for 21=7/3y equation: 


y in (-oo:+oo)

21 = (7/3)*y // - (7/3)*y

21-((7/3)*y) = 0

(-7/3)*y+21 = 0

21-7/3*y = 0 // - 21

-7/3*y = -21 // : -7/3

y = -21/(-7/3)

y = 9

y = 9

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