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a in (-oo:+oo)
39 = 5*a+a+3 // - 5*a+a+3
39-(5*a)-a-3 = 0
39-5*a-a-3 = 0
36-6*a = 0 // - 36
-6*a = -36 // : -6
a = -36/(-6)
a = 6
a = 6
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