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x in (-oo:+oo)
7 = (6/7)*x-x-1 // - (6/7)*x-x-1
x-((6/7)*x)+1+7 = 0
(-6/7)*x+x+1+7 = 0
1/7*x+8 = 0 // - 8
1/7*x = -8 // : 1/7
x = -8/1/7
x = -56
x = -56
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