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x in (-oo:+oo)
-4*x-1 = 2*x-55 // - 2*x-55
55-4*x-(2*x)-1 = 0
55-4*x-2*x-1 = 0
54-6*x = 0 // - 54
-6*x = -54 // : -6
x = -54/(-6)
x = 9
x = 9
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