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x in (-oo:+oo)
-67 = 5*x+x-1 // - 5*x+x-1
1-(5*x)-x-67 = 0
1-5*x-x-67 = 0
-6*x-66 = 0 // + 66
-6*x = 66 // : -6
x = 66/(-6)
x = -11
x = -11
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