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x in (-oo:+oo)
(13/12)*x = (7/3)*x-(5/12) // - (7/3)*x-(5/12)
(13/12)*x-((7/3)*x)+5/12 = 0
(13/12)*x+(-7/3)*x+5/12 = 0
5/12-5/4*x = 0 // - 5/12
-5/4*x = -5/12 // : -5/4
x = -5/12/(-5/4)
x = 1/3
x = 1/3
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