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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*a)/3+6 = 0
(1/2*3*(a-2))/3+(-2*a)/3+(3*6)/3 = 0
1/2*3*(a-2)-2*a+3*6 = 0
18-1/2*a-3 = 0
15-1/2*a = 0
(15-1/2*a)/3 = 0
(15-1/2*a)/3 = 0 // * 3
15-1/2*a = 0
15-1/2*a = 0 // - 15
-1/2*a = -15 // : -1/2
a = -15/(-1/2)
a = 30
a = 30
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