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x in (-oo:+oo)
(1/2)*(x-9) = 2*x-4 // - 2*x-4
(1/2)*(x-9)-(2*x)+4 = 0
(1/2)*(x-9)-2*x+4 = 0
1/2*(x-9)-2*x+4 = 0
1/2*(x-9)-2*x+4 = 0
4-3/2*x-9/2 = 0
-3/2*x-1/2 = 0
-3/2*x-1/2 = 0
-3/2*x-1/2 = 0 // + 1/2
-3/2*x = 1/2 // : -3/2
x = 1/2/(-3/2)
x = -1/3
x = -1/3
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