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x in (-oo:+oo)
x/15 = 120/250 // - 120/250
x/15-(120/250) = 0
x/15-12/25 = 0
1/15*x-12/25 = 0 // + 12/25
1/15*x = 12/25 // : 1/15
x = 12/25/1/15
x = 36/5
x = 36/5
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