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x in (-oo:+oo)
55/8 = 5*x+(3/4)*x+4 // - 5*x+(3/4)*x+4
55/8-(5*x)-((3/4)*x)-4 = 0
(-3/4)*x-5*x+55/8-4 = 0
23/8-23/4*x = 0 // - 23/8
-23/4*x = -23/8 // : -23/4
x = -23/8/(-23/4)
x = 1/2
x = 1/2
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