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