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x in (-oo:+oo)
-15 = x/2-3 // - x/2-3
3-(x/2)-15 = 0
-1/2*x-12 = 0 // + 12
-1/2*x = 12 // : -1/2
x = 12/(-1/2)
x = -24
x = -24
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