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a*((3*a-b)/6)-(a*((8*a-(7*b))/6)) = 0
a*((3*a-b)/6)-(a*((8*a-7*b)/6)) = 0
(a*(3*a-b))/6+(-1*a*(8*a-7*b))/6 = 0
a*(3*a-b)-1*a*(8*a-7*b) = 0
6*a*b-5*a^2 = 0
(6*a*b-5*a^2)/6 = 0
(6*a*b-5*a^2)/6 = 0 // * 6
6*a*b-5*a^2 = 0
x belongs to the empty set
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