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x in (-oo:+oo)
-11 = 6*x-(2*x)+5 // - 6*x-(2*x)+5
2*x-(6*x)-11-5 = 0
2*x-6*x-11-5 = 0
-4*x-16 = 0 // + 16
-4*x = 16 // : -4
x = 16/(-4)
x = -4
x = -4
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