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x in (-oo:+oo)
x-(6*x)-8 = -28 // + 28
x-(6*x)-8+28 = 0
x-6*x-8+28 = 0
20-5*x = 0 // - 20
-5*x = -20 // : -5
x = -20/(-5)
x = 4
x = 4
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