-21=v/3-6

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Solution for -21=v/3-6 equation: 


v in (-oo:+oo)

-21 = v/3-6 // - v/3-6

6-(v/3)-21 = 0

-1/3*v-15 = 0 // + 15

-1/3*v = 15 // : -1/3

v = 15/(-1/3)

v = -45

v = -45

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