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x in (-oo:+oo)
15*x = 18/27 // - 18/27
15*x-(18/27) = 0
15*x-2/3 = 0
15*x-2/3 = 0 // + 2/3
15*x = 2/3 // : 15
x = 2/3/15
x = 2/45
x = 2/45
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