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x in (-oo:+oo)
15*x-(23*x) = 1/2 // - 1/2
15*x-(23*x)-(1/2) = 0
15*x-23*x-1/2 = 0
-8*x-1/2 = 0 // + 1/2
-8*x = 1/2 // : -8
x = 1/2/(-8)
x = -1/16
x = -1/16
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