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

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

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

y = -21/7/3

y = -9

y = -9

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