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x in (-oo:+oo)
x/15 = 5/25 // - 5/25
x/15-(5/25) = 0
x/15-1/5 = 0
1/15*x-1/5 = 0 // + 1/5
1/15*x = 1/5 // : 1/15
x = 1/5/1/15
x = 3
x = 3
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