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x in (-oo:+oo)
1/2 = x/15 // - x/15
1/2-(x/15) = 0
1/2-1/15*x = 0 // - 1/2
-1/15*x = -1/2 // : -1/15
x = -1/2/(-1/15)
x = 15/2
x = 15/2
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