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x in (-oo:+oo)
x/15 = 12/15 // - 12/15
x/15-(12/15) = 0
x/15-4/5 = 0
1/15*x-4/5 = 0 // + 4/5
1/15*x = 4/5 // : 1/15
x = 4/5/1/15
x = 12
x = 12
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