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v in (-oo:+oo)
4 = -3*v-(-7/8) // + -3*v-(-7/8)
4-(-3*v)-7/8 = 0
3*v-7/8+4 = 0
3*v+25/8 = 0 // - 25/8
3*v = -25/8 // : 3
v = -25/8/3
v = -25/24
v = -25/24
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