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x in (-oo:+oo)
(1/3)*x+3/5 = (4/5)*x-(1/3) // - (4/5)*x-(1/3)
(1/3)*x-((4/5)*x)+3/5+1/3 = 0
(1/3)*x+(-4/5)*x+3/5+1/3 = 0
14/15-7/15*x = 0 // - 14/15
-7/15*x = -14/15 // : -7/15
x = -14/15/(-7/15)
x = 2
x = 2
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