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x in (-oo:+oo)
-71 = 1-3*x-(6*x) // - 1-3*x-(6*x)
6*x-(-3*x)-71-1 = 0
3*x+6*x-71-1 = 0
9*x-72 = 0 // + 72
9*x = 72 // : 9
x = 72/9
x = 8
x = 8
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