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x in (-oo:+oo)
(2/5)*x = 7/15 // - 7/15
(2/5)*x-(7/15) = 0
(2/5)*x-7/15 = 0
2/5*x-7/15 = 0 // + 7/15
2/5*x = 7/15 // : 2/5
x = 7/15/2/5
x = 7/6
x = 7/6
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