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v in (-oo:+oo)
-28 = (-4/3)*v // - (-4/3)*v
-((-4/3)*v)-28 = 0
(4/3)*v-28 = 0
4/3*v-28 = 0 // + 28
4/3*v = 28 // : 4/3
v = 28/4/3
v = 21
v = 21
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