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x in (-oo:+oo)
x/15 = 8/12 // - 8/12
x/15-(8/12) = 0
x/15-2/3 = 0
1/15*x-2/3 = 0 // + 2/3
1/15*x = 2/3 // : 1/15
x = 2/3/1/15
x = 10
x = 10
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