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x in (-oo:+oo)
(1/2)*(x+5) = x-4 // - x-4
(1/2)*(x+5)-x+4 = 0
1/2*(x+5)-x+4 = 0
1/2*(x+5)-x+4 = 0
5/2-1/2*x+4 = 0
13/2-1/2*x = 0
13/2-1/2*x = 0
13/2-1/2*x = 0 // - 13/2
-1/2*x = -13/2 // : -1/2
x = -13/2/(-1/2)
x = 13
x = 13
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