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v in (-oo:+oo)
-v/5 = 2.8 // - 2.8
-v/5-2.8 = 0
-1/5*v-2.8 = 0 // + 2.8
-1/5*v = 2.8 // : -1/5
v = 2.8/(-1/5)
v = -14
v = -14
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