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7*a-(a*((9*a-(7*x))/3))-(a*((6*x)/6))+6 = 0
7*a-(a*((9*a-7*x)/3))-(a*x)+6 = 0
(-1*a*(9*a-7*x))/3+7*a-(a*x)+6 = 0
(-1*a*(9*a-7*x))/3+(3*7*a)/3+(3*(-a)*(-x))/3+(3*6)/3 = 0
3*7*a-1*a*(9*a-7*x)+3*(-a)*(-x)+3*6 = 0
7*a*x-9*a^2+21*a-3*a*x+18 = 0
21*a-9*a^2+4*a*x+18 = 0
(21*a-9*a^2+4*a*x+18)/3 = 0
(21*a-9*a^2+4*a*x+18)/3 = 0 // * 3
21*a-9*a^2+4*a*x+18 = 0
4*a*x-9*a^2+21*a+18 = 0 // - 21*a-9*a^2+18
4*a*x = -(21*a-9*a^2+18) // : 4*a
x = (-(21*a-9*a^2+18))/(4*a)
x = (-1/4)*a^-1*(21*a-9*a^2+18)
x = (-1/4)*a^-1*(21*a-9*a^2+18)
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