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x in (-oo:+oo)
(2*x)/5-(1/15) = 1 // - 1
(2*x)/5-(1/15)-1 = 0
(2*x)/5-1/15-1 = 0
2/5*x-16/15 = 0 // + 16/15
2/5*x = 16/15 // : 2/5
x = 16/15/2/5
x = 8/3
x = 8/3
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