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a in (-oo:+oo)
2/3-(5*a) = (-1/3)*(4-9*a) // - (-1/3)*(4-9*a)
2/3-((-1/3)*(4-9*a))-(5*a) = 0
(1/3)*(4-9*a)-5*a+2/3 = 0
1/3*(4-9*a)-5*a+2/3 = 0
(1/3*3*(4-9*a))/3+(-5*3*a)/3+2/3 = 0
1/3*3*(4-9*a)-5*3*a+2 = 0
2-24*a+4 = 0
6-24*a = 0
(6-24*a)/3 = 0
(6-24*a)/3 = 0 // * 3
6-24*a = 0
6-24*a = 0 // - 6
-24*a = -6 // : -24
a = -6/(-24)
a = 1/4
a = 1/4
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