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a*((-(9*a-(6*x)))/2)+a*((8*a-(8*x))/2) = 0
a*((-(9*a-6*x))/2)+a*((8*a-8*x)/2) = 0
(a*(6*x-9*a))/2+(a*(8*a-8*x))/2 = 0
a*(6*x-9*a)+a*(8*a-8*x) = 0
-a^2-2*a*x = 0
(-a^2-2*a*x)/2 = 0
(-a^2-2*a*x)/2 = 0 // * 2
-a^2-2*a*x = 0
-2*a*x-a^2 = 0 // + a^2
-2*a*x = a^2 // : -2*a
x = (a^2)/(-2*a)
x = (-1/2)*a
x = (-1/2)*a
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