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X in (-oo:+oo)
(3/8)*X+1/2 = (5/8)*X+5/12 // - (5/8)*X+5/12
(3/8)*X-((5/8)*X)+1/2-(5/12) = 0
(3/8)*X+(-5/8)*X+1/2-5/12 = 0
1/12-1/4*X = 0 // - 1/12
-1/4*X = -1/12 // : -1/4
X = -1/12/(-1/4)
X = 1/3
X = 1/3
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