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x in (-oo:+oo)
(2/3)*x-(3/5) = 7/15 // - 7/15
(2/3)*x-(3/5)-(7/15) = 0
(2/3)*x-3/5-7/15 = 0
2/3*x-16/15 = 0 // + 16/15
2/3*x = 16/15 // : 2/3
x = 16/15/2/3
x = 8/5
x = 8/5
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