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a in (-oo:+oo)
6-3*a-(3*a) = 9/5 // - 9/5
6-3*a-(3*a)-(9/5) = 0
6-3*a-3*a-9/5 = 0
21/5-6*a = 0 // - 21/5
-6*a = -21/5 // : -6
a = -21/5/(-6)
a = 7/10
a = 7/10
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