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