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v in (-oo:+oo)
v/7.5 = 3 // - 3
v/7.5-3 = 0
0.13333333*v-3 = 0 // + 3
0.13333333*v = 3 // : 0.13333333
v = 3/0.13333333
v = 22.50000056
v = 22.50000056
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