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a in (-oo:+oo)
(1/2)*(a-2) = (2/3)*(a-6) // - (2/3)*(a-6)
(1/2)*(a-2)-((2/3)*(a-6)) = 0
(1/2)*(a-2)+(-2/3)*(a-6) = 0
1/2*(a-2)-2/3*(a-6) = 0
1/2*(a-2)-2/3*(a-6) = 0
3-1/6*a = 0
3-1/6*a = 0
3-1/6*a = 0 // - 3
-1/6*a = -3 // : -1/6
a = -3/(-1/6)
a = 18
a = 18
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