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x in (-oo:+oo)
(1/3)*x+(1/5)*x-(2/3) = 1 // - 1
(1/3)*x+(1/5)*x-(2/3)-1 = 0
(1/3)*x+(1/5)*x-2/3-1 = 0
8/15*x-5/3 = 0 // + 5/3
8/15*x = 5/3 // : 8/15
x = 5/3/8/15
x = 25/8
x = 25/8
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