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a in (-oo:+oo)
(13/4)*(5-(6*a))-((1/4)*((1/3)*a-3)) = 0
(13/4)*(5-6*a)+(-1/4)*((1/3)*a-3) = 0
13/4*(5-6*a)-1/4*(1/3*a-3) = 0
13/4*(5-6*a)-1/4*(1/3*a-3) = 0
17-235/12*a = 0
17-235/12*a = 0
17-235/12*a = 0 // - 17
-235/12*a = -17 // : -235/12
a = -17/(-235/12)
a = 204/235
a = 204/235
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