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a in (-oo:+oo)
10/3 = 4*((-3*a)/4-(2/3))+10*a // - 4*((-3*a)/4-(2/3))+10*a
10/3-(4*((-3*a)/4-(2/3)))-(10*a) = 0
10/3-4*((-3*a)/4-2/3)-10*a = 0
10/3-4*(-3/4*a-2/3)-10*a = 0
(-4*3*(-3/4*a-2/3))/3+(-10*3*a)/3+10/3 = 0
10-4*3*(-3/4*a-2/3)-10*3*a = 0
8-21*a+10 = 0
18-21*a = 0
(18-21*a)/3 = 0
(18-21*a)/3 = 0 // * 3
18-21*a = 0
18-21*a = 0 // - 18
-21*a = -18 // : -21
a = -18/(-21)
a = 6/7
a = 6/7
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