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x in (-oo:+oo)
67 = 4*x+2*x-5 // - 4*x+2*x-5
5-(4*x)-(2*x)+67 = 0
5-4*x-2*x+67 = 0
72-6*x = 0 // - 72
-6*x = -72 // : -6
x = -72/(-6)
x = 12
x = 12
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