21=-7/3*v

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Solution for 21=-7/3*v equation: 


v in (-oo:+oo)

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

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

(7/3)*v+21 = 0

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

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

v = -21/7/3

v = -9

v = -9

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