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3*a-(a*((8*x)/2))-a+a*((9*x)/6)+3 = 0
3*a-4*a*x-a+a*((9*x)/6)+3 = 0
2*a-5/2*a*x+3 = 0 // - 2*a+3
-5/2*a*x = -(2*a+3) // : -5/2*a
x = (-(2*a+3))/(-5/2*a)
x = 2/5*a^-1*(2*a+3)
x = 2/5*a^-1*(2*a+3)
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