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x in (-oo:+oo)
(x+3)/2 = x-4 // - x-4
(x+3)/2-x+4 = 0
(x+3)/2+(2*(-x))/2+(2*4)/2 = 0
x+2*(-x)+2*4+3 = 0
3-x+8 = 0
11-x = 0
(11-x)/2 = 0
(11-x)/2 = 0 // * 2
11-x = 0
11-x = 0 // - 11
-x = -11 // * -1
x = 11
x = 11
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