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