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a in (-oo:+oo)
10/3 = 5*a+3*a+2/3 // - 5*a+3*a+2/3
10/3-(5*a)-(3*a)-(2/3) = 0
10/3-5*a-3*a-2/3 = 0
8/3-8*a = 0 // - 8/3
-8*a = -8/3 // : -8
a = -8/3/(-8)
a = 1/3
a = 1/3
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