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x in (-oo:+oo)
27 = 6*x-2*x-1 // - 6*x-2*x-1
1-(-2*x)-(6*x)+27 = 0
2*x-6*x+1+27 = 0
28-4*x = 0 // - 28
-4*x = -28 // : -4
x = -28/(-4)
x = 7
x = 7
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