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x in (-oo:+oo)
x/15 = 12/6 // - 12/6
x/15-(12/6) = 0
x/15-2 = 0
1/15*x-2 = 0 // + 2
1/15*x = 2 // : 1/15
x = 2/1/15
x = 30
x = 30
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