81-4v/7=21

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Solution for 81-4v/7=21 equation: 


v in (-oo:+oo)

81-((4*v)/7) = 21 // - 21

81-((4*v)/7)-21 = 0

(-4/7)*v-21+81 = 0

60-4/7*v = 0 // - 60

-4/7*v = -60 // : -4/7

v = -60/(-4/7)

v = 105

v = 105

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