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x in (-oo:+oo)
x/15 = 8/20 // - 8/20
x/15-(8/20) = 0
x/15-2/5 = 0
1/15*x-2/5 = 0 // + 2/5
1/15*x = 2/5 // : 1/15
x = 2/5/1/15
x = 6
x = 6
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