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-(a*((8*a-(13*x))/6))-(a*((11*a+7*x)/6)) = 0
-(a*((8*a-13*x)/6))-(a*((11*a+7*x)/6)) = 0
(-1*a*(8*a-13*x))/6+(-1*a*(11*a+7*x))/6 = 0
-1*a*(8*a-13*x)-1*a*(11*a+7*x) = 0
6*a*x-19*a^2 = 0
(6*a*x-19*a^2)/6 = 0
(6*a*x-19*a^2)/6 = 0 // * 6
6*a*x-19*a^2 = 0
6*a*x-19*a^2 = 0 // + -19*a^2
6*a*x = -(-19*a^2) // : 6*a
x = (-(-19*a^2))/(6*a)
x = (19*a)/6
x = (19*a)/6
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