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x in (-oo:+oo)
x = (1/8)*x-1 // - (1/8)*x-1
x-((1/8)*x)+1 = 0
x+(-1/8)*x+1 = 0
7/8*x+1 = 0 // - 1
7/8*x = -1 // : 7/8
x = -1/7/8
x = -8/7
x = -8/7
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