(x+1)^2/3-((x+2)(x-2))/2=(x+3)/2-(x-2)^2/6
<=> Udvid
(x^2+2x+1)/3 - (x^2-4)/2 = (x+3)/2 - (x^2-4x+4)/6
<=> Gang igennem med 6
2*(x^2+2x+1) - 3*(x^2-4) = 3*(x+3) - (x^2-4x+4)
<=> Gang paranteser ud (Husk fortegn)
2x^2+4x+2-3x^2+12 = 3x+9-x^2+4x-4
<=> Reducer mest muligt
-3*x-9 = 0 <=> x=3