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