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x in (-oo:+oo)
(1/3)*X = (11/15)*x+2/5 // - (11/15)*x+2/5
(1/3)*X-((11/15)*x)-(2/5) = 0
(1/3)*X+(-11/15)*x-2/5 = 0
1/3*X-11/15*x-2/5 = 0 // - 1/3*X-2/5
-11/15*x = -(1/3*X-2/5) // : -11/15
x = (-(1/3*X-2/5))/(-11/15)
x = -15/11*(2/5-(1/3*X))
x = -15/11*(2/5-(1/3*X))
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