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a in (-oo:+oo)
5 = a/3+2/3 // - a/3+2/3
5-(a/3)-(2/3) = 0
5-(a/3)-2/3 = 0
13/3-1/3*a = 0 // - 13/3
-1/3*a = -13/3 // : -1/3
a = -13/3/(-1/3)
a = 13
a = 13
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