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x in (-oo:+oo)
(1/2)*x-(2*x)+1/2+6 = 7/2 // - 7/2
(1/2)*x-(2*x)+1/2-(7/2)+6 = 0
(1/2)*x-2*x+1/2-7/2+6 = 0
3-3/2*x = 0 // - 3
-3/2*x = -3 // : -3/2
x = -3/(-3/2)
x = 2
x = 2
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