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x in (-oo:+oo)
(1/8)*(x-16)-((1/8)*(x-8)) = x-8 // - x-8
(1/8)*(x-16)-((1/8)*(x-8))-x+8 = 0
(1/8)*(x-16)+(-1/8)*(x-8)-x+8 = 0
1/8*(x-16)-1/8*(x-8)-x+8 = 0
1/8*(x-16)-1/8*(x-8)-x+8 = 0
8-x-1 = 0
7-x = 0
7-x = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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