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x in (-oo:+oo)
(-1/2)*x+1/2 = (-2/3)*x+20/33 // - (-2/3)*x+20/33
(-1/2)*x-((-2/3)*x)+1/2-(20/33) = 0
(-1/2)*x+(2/3)*x+1/2-20/33 = 0
1/6*x-7/66 = 0 // + 7/66
1/6*x = 7/66 // : 1/6
x = 7/66/1/6
x = 7/11
x = 7/11
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