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x in (-oo:+oo)
-9 = (1/2)*(x-8) // - (1/2)*(x-8)
-((1/2)*(x-8))-9 = 0
(-1/2)*(x-8)-9 = 0
-1/2*(x-8)-9 = 0
-1/2*(x-8)-9 = 0
-1/2*x-5 = 0
-1/2*x-5 = 0
-1/2*x-5 = 0 // + 5
-1/2*x = 5 // : -1/2
x = 5/(-1/2)
x = -10
x = -10
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