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v in (-oo:+oo)
-15/7 = -5*v // + -5*v
-(-5*v)-15/7 = 0
5*v-15/7 = 0
5*v-15/7 = 0 // + 15/7
5*v = 15/7 // : 5
v = 15/7/5
v = 3/7
v = 3/7
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