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a in (-oo:+oo)
(1/6)*(a-2) = (2/3)*(a+8)-((1/3)*a) // - (2/3)*(a+8)-((1/3)*a)
(1/6)*(a-2)-((2/3)*(a+8))+(1/3)*a = 0
(1/6)*(a-2)+(-2/3)*(a+8)+(1/3)*a = 0
1/6*(a-2)-2/3*(a+8)+a/3 = 0
(1/6*3*(a-2))/3+(-2/3*3*(a+8))/3+a/3 = 0
1/6*3*(a-2)-2/3*3*(a+8)+a = 0
a-3/2*a-17 = 0
-1/2*a-17 = 0
(-1/2*a-17)/3 = 0
(-1/2*a-17)/3 = 0 // * 3
-1/2*a-17 = 0
-1/2*a-17 = 0 // + 17
-1/2*a = 17 // : -1/2
a = 17/(-1/2)
a = -34
a = -34
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