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x in (-oo:+oo)
(2/15)*x-(1/5) = 1 // - 1
(2/15)*x-(1/5)-1 = 0
(2/15)*x-1/5-1 = 0
2/15*x-6/5 = 0 // + 6/5
2/15*x = 6/5 // : 2/15
x = 6/5/2/15
x = 9
x = 9
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