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x in (-oo:+oo)
x/15 = 12/75 // - 12/75
x/15-(12/75) = 0
x/15-4/25 = 0
1/15*x-4/25 = 0 // + 4/25
1/15*x = 4/25 // : 1/15
x = 4/25/1/15
x = 12/5
x = 12/5
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