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x in (-oo:+oo)
-23 = x/3-8 // - x/3-8
8-(x/3)-23 = 0
-1/3*x-15 = 0 // + 15
-1/3*x = 15 // : -1/3
x = 15/(-1/3)
x = -45
x = -45
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