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a in (-oo:+oo)
(4*a+7)/6+a*((3*a-5)/3) = 0
(4*a+7)/6+(a*(3*a-5))/3 = 0
(3*(4*a+7))/(3*6)+(6*a*(3*a-5))/(3*6) = 0
3*(4*a+7)+6*a*(3*a-5) = 0
18*a^2-18*a+21 = 0
18*a^2-18*a+21 = 0
3*(6*a^2-6*a+7) = 0
6*a^2-6*a+7 = 0
DELTA = (-6)^2-(4*6*7)
DELTA = -132
DELTA < 0
3 = 0
3/(3*6) = 0
3/(3*6) = 0 // * 3*6
3 = 0
a belongs to the empty set
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