21/2=7y

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Solution for 21/2=7y equation: 


y in (-oo:+oo)

21/2 = 7*y // - 7*y

21/2-(7*y) = 0

21/2-7*y = 0

21/2-7*y = 0 // - 21/2

-7*y = -21/2 // : -7

y = -21/2/(-7)

y = 3/2

y = 3/2

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