4/7=-7/5v

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Solution for 4/7=-7/5v equation: 


v in (-oo:+oo)

4/7 = (-7/5)*v // - (-7/5)*v

4/7-((-7/5)*v) = 0

(7/5)*v+4/7 = 0

7/5*v+4/7 = 0 // - 4/7

7/5*v = -4/7 // : 7/5

v = -4/7/7/5

v = -20/49

v = -20/49

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