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