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a*((9*a-(5*b))/2)-(a*((6*a-(7*b))/2)) = 0
a*((9*a-5*b)/2)-(a*((6*a-7*b)/2)) = 0
(a*(9*a-5*b))/2+(-1*a*(6*a-7*b))/2 = 0
a*(9*a-5*b)-1*a*(6*a-7*b) = 0
3*a^2+2*a*b = 0
(3*a^2+2*a*b)/2 = 0
(3*a^2+2*a*b)/2 = 0 // * 2
3*a^2+2*a*b = 0
x belongs to the empty set
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