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