21=v/4+13

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Solution for 21=v/4+13 equation: 


v in (-oo:+oo)

21 = v/4+13 // - v/4+13

21-(v/4)-13 = 0

8-1/4*v = 0 // - 8

-1/4*v = -8 // : -1/4

v = -8/(-1/4)

v = 32

v = 32

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