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a in (-oo:+oo)
(1/2)*(6*a-4) = 4*a-9 // - 4*a-9
(1/2)*(6*a-4)-(4*a)+9 = 0
(1/2)*(6*a-4)-4*a+9 = 0
1/2*(6*a-4)-4*a+9 = 0
1/2*(6*a-4)-4*a+9 = 0
9-a-2 = 0
7-a = 0
7-a = 0
7-a = 0 // - 7
-a = -7 // * -1
a = 7
a = 7
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