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v in (-oo:+oo)
v/4+2 = -3.12 // + 3.12
v/4+2+3.12 = 0
1/4*v+5.12 = 0 // - 5.12
1/4*v = -5.12 // : 1/4
v = -5.12/1/4
v = -20.48
v = -20.48
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