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v in (-oo:+oo)
6*v = 4*v-(8/2) // - 4*v-(8/2)
6*v-(4*v)+8/2 = 0
6*v-4*v+8/2 = 0
2*v+4 = 0 // - 4
2*v = -4 // : 2
v = -4/2
v = -2
v = -2
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