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