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x in (-oo:+oo)
3*x-(6*x)-5 = -23 // + 23
3*x-(6*x)-5+23 = 0
3*x-6*x-5+23 = 0
18-3*x = 0 // - 18
-3*x = -18 // : -3
x = -18/(-3)
x = 6
x = 6
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