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