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x in (-oo:+oo)
x/15 = 12/27 // - 12/27
x/15-(12/27) = 0
x/15-4/9 = 0
1/15*x-4/9 = 0 // + 4/9
1/15*x = 4/9 // : 1/15
x = 4/9/1/15
x = 20/3
x = 20/3
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