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v in (-oo:+oo)
(-9/8)*v+7/2 = -5/4 // + -5/4
(-9/8)*v+7/2-(-5/4) = 0
(-9/8)*v+7/2+5/4 = 0
19/4-9/8*v = 0 // - 19/4
-9/8*v = -19/4 // : -9/8
v = -19/4/(-9/8)
v = 38/9
v = 38/9
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