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x in (-oo:+oo)
(1/2)*x+(5/8)*x = (3/4)*x-6 // - (3/4)*x-6
(1/2)*x+(5/8)*x-((3/4)*x)+6 = 0
(1/2)*x+(5/8)*x+(-3/4)*x+6 = 0
3/8*x+6 = 0 // - 6
3/8*x = -6 // : 3/8
x = -6/3/8
x = -16
x = -16
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