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(3*w-3*v)/(-4) = v*((9*v+x)/6) // - v*((9*v+x)/6)
(3*w-3*v)/(-4)-(v*((9*v+x)/6)) = 0
(3*w-3*v)/(-4)+(-1*v*(9*v+x))/6 = 0
(6*(3*w-3*v))/(-4*6)+(-4*(-1)*v*(9*v+x))/(-4*6) = 0
6*(3*w-3*v)-4*(-1)*v*(9*v+x) = 0
36*v^2-18*v+4*v*x+18*w = 0
(36*v^2-18*v+4*v*x+18*w)/(-4*6) = 0
(36*v^2-18*v+4*v*x+18*w)/(-4*6) = 0 // * -4*6
36*v^2-18*v+4*v*x+18*w = 0
4*v*x+36*v^2-18*v+18*w = 0 // - 36*v^2-18*v+18*w
4*v*x = -(36*v^2-18*v+18*w) // : 4*v
x = (-(36*v^2-18*v+18*w))/(4*v)
x = (-1/4)*v^-1*(36*v^2-18*v+18*w)
x = (-1/4)*v^-1*(36*v^2-18*v+18*w)
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