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v in (-oo:+oo)
5 = v/6.25 // - v/6.25
5-(v/6.25) = 0
5-0.16*v = 0
5-0.16*v = 0 // - 5
-0.16*v = -5 // : -0.16
v = -5/(-0.16)
v = 31.25
v = 31.25
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