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a*((9*a-(7*x))/3) = 0
a*((9*a-7*x)/3) = 0
(a*(9*a-7*x))/3 = 0
9*a-7*x = 0 // - 9*a
-7*x = -(9*a) // : -7
x = (-(9*a))/(-7)
x = (-9*a)/(-7)
x = (-9*a)/(-7)
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