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v in (-oo:+oo)
v/1.3+5 = 7.4 // - 7.4
v/1.3-7.4+5 = 0
0.76923077*v-2.4 = 0 // + 2.4
0.76923077*v = 2.4 // : 0.76923077
v = 2.4/0.76923077
v = 3.12
v = 3.12
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