-1/2=4/7v-4/5

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Solution for -1/2=4/7v-4/5 equation: 


v in (-oo:+oo)

-1/2 = (4/7)*v-(4/5) // - (4/7)*v-(4/5)

4/5-((4/7)*v)-1/2 = 0

(-4/7)*v-1/2+4/5 = 0

3/10-4/7*v = 0 // - 3/10

-4/7*v = -3/10 // : -4/7

v = -3/10/(-4/7)

v = 21/40

v = 21/40

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