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a*((8*a-(8*x))/2)-(a*((6*a-(7*x))/2)) = 0
a*((8*a-8*x)/2)-(a*((6*a-7*x)/2)) = 0
(-1*a*(6*a-7*x))/2+(a*(8*a-8*x))/2 = 0
a*(8*a-8*x)-1*a*(6*a-7*x) = 0
2*a^2-(a*x) = 0
(2*a^2-(a*x))/2 = 0
(2*a^2-(a*x))/2 = 0 // * 2
2*a^2-(a*x) = 0
2*a^2-a*x = 0 // - 2*a^2
-a*x = -(2*a^2) // : -a
x = (-(2*a^2))/(-a)
x = 2*a
x = 2*a
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