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a in (-oo:+oo)
25/3 = (28*a)/3-(4*((4*a)/3-(1/3))) // - (28*a)/3-(4*((4*a)/3-(1/3)))
4*((4*a)/3-(1/3))-((28*a)/3)+25/3 = 0
4*((4*a)/3-1/3)+(-28/3)*a+25/3 = 0
4*(4/3*a-1/3)+(-28*a)/3+25/3 = 0
(3*4*(4/3*a-1/3))/3+(-28*a)/3+25/3 = 0
3*4*(4/3*a-1/3)-28*a+25 = 0
25-12*a-4 = 0
21-12*a = 0
(21-12*a)/3 = 0
(21-12*a)/3 = 0 // * 3
21-12*a = 0
21-12*a = 0 // - 21
-12*a = -21 // : -12
a = -21/(-12)
a = 7/4
a = 7/4
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