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x in (-oo:+oo)
(8/15)*x = 12/5 // - 12/5
(8/15)*x-(12/5) = 0
(8/15)*x-12/5 = 0
8/15*x-12/5 = 0 // + 12/5
8/15*x = 12/5 // : 8/15
x = 12/5/8/15
x = 9/2
x = 9/2
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