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a*((4*b-a)/2)+a*((-5*a-(5*b))/2) = 0
a*((4*b-a)/2)+a*((-5*a-5*b)/2) = 0
(a*(4*b-a))/2+(a*(-5*a-5*b))/2 = 0
a*(4*b-a)+a*(-5*a-5*b) = 0
-6*a^2-(a*b) = 0
(-6*a^2-(a*b))/2 = 0
(-6*a^2-(a*b))/2 = 0 // * 2
-6*a^2-(a*b) = 0
x belongs to the empty set
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