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x in (-oo:+oo)
x = 9*a-(a*((4*b)/2)) // - 9*a-(a*((4*b)/2))
a*((4*b)/2)-(9*a)+x = 0
a*((4*b)/2)-9*a+x = 0
2*a*b-9*a+x = 0 // - 2*a*b-9*a
x = -(2*a*b-9*a)
x = -(2*a*b-9*a)
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