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v in (-oo:+oo)
(-7/9)*v = 5/9 // - 5/9
(-7/9)*v-(5/9) = 0
(-7/9)*v-5/9 = 0
-7/9*v-5/9 = 0 // + 5/9
-7/9*v = 5/9 // : -7/9
v = 5/9/(-7/9)
v = -5/7
v = -5/7
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