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x in (-oo:+oo)
(2/5)*x-(1/3) = 1 // - 1
(2/5)*x-(1/3)-1 = 0
(2/5)*x-1/3-1 = 0
2/5*x-4/3 = 0 // + 4/3
2/5*x = 4/3 // : 2/5
x = 4/3/2/5
x = 10/3
x = 10/3
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