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v in (-oo:+oo)
3/2-((7/4)*v) = -9/8 // + -9/8
3/2-((7/4)*v)-(-9/8) = 0
(-7/4)*v+3/2+9/8 = 0
21/8-7/4*v = 0 // - 21/8
-7/4*v = -21/8 // : -7/4
v = -21/8/(-7/4)
v = 3/2
v = 3/2
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