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