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x in (-oo:+oo)
(4*x+12)/2 = 3*x-5 // - 3*x-5
(4*x+12)/2-(3*x)+5 = 0
(4*x+12)/2-3*x+5 = 0
(4*x+12)/2+(-3*2*x)/2+(2*5)/2 = 0
4*x-3*2*x+2*5+12 = 0
10-2*x+12 = 0
22-2*x = 0
(22-2*x)/2 = 0
(22-2*x)/2 = 0 // * 2
22-2*x = 0
22-2*x = 0 // - 22
-2*x = -22 // : -2
x = -22/(-2)
x = 11
x = 11
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