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y in (-oo:+oo)
(3/4)*y-1 = (-7/8)*y+4 // - (-7/8)*y+4
(3/4)*y-((-7/8)*y)-4-1 = 0
(3/4)*y+(7/8)*y-4-1 = 0
13/8*y-5 = 0 // + 5
13/8*y = 5 // : 13/8
y = 5/13/8
y = 40/13
y = 40/13
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