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x in (-oo:+oo)
(1/2)*(3-x) = x-9 // - x-9
(1/2)*(3-x)-x+9 = 0
1/2*(3-x)-x+9 = 0
1/2*(3-x)-x+9 = 0
3/2-3/2*x+9 = 0
21/2-3/2*x = 0
21/2-3/2*x = 0
21/2-3/2*x = 0 // - 21/2
-3/2*x = -21/2 // : -3/2
x = -21/2/(-3/2)
x = 7
x = 7
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