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a*((9*a-(7*x))/4)-(a*((a-(8*x))/4)) = 0
a*((9*a-7*x)/4)-(a*((a-8*x)/4)) = 0
(-1*a*(a-8*x))/4+(a*(9*a-7*x))/4 = 0
a*(9*a-7*x)-1*a*(a-8*x) = 0
8*a^2+a*x = 0
(8*a^2+a*x)/4 = 0
(8*a^2+a*x)/4 = 0 // * 4
8*a^2+a*x = 0
a*x+8*a^2 = 0 // - 8*a^2
a*x = -(8*a^2) // : a
x = (-(8*a^2))/a
x = -8*a
x = -8*a
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