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