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x in (-oo:+oo)
8*(1-((7/8)*x))+7*x = 8 // - 8
8*(1-((7/8)*x))+7*x-8 = 0
8*((-7/8)*x+1)+7*x-8 = 0
8*(1-7/8*x)+7*x-8 = 0
8*(1-7/8*x)+7*x-8 = 0
8-8 = 0
0 = 0
0 = 0
x belongs to the empty set
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