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v in (-oo:+oo)
(-1/3)*v+7/3 = (-2/5)*v-2 // - (-2/5)*v-2
(-1/3)*v-((-2/5)*v)+7/3+2 = 0
(-1/3)*v+(2/5)*v+7/3+2 = 0
1/15*v+13/3 = 0 // - 13/3
1/15*v = -13/3 // : 1/15
v = -13/3/1/15
v = -65
v = -65
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