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x in (-oo:+oo)
x/20 = 12/15 // - 12/15
x/20-(12/15) = 0
x/20-4/5 = 0
1/20*x-4/5 = 0 // + 4/5
1/20*x = 4/5 // : 1/20
x = 4/5/1/20
x = 16
x = 16
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