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a in (-oo:+oo)
83 = 3*a+6*a+2 // - 3*a+6*a+2
83-(3*a)-(6*a)-2 = 0
83-3*a-6*a-2 = 0
81-9*a = 0 // - 81
-9*a = -81 // : -9
a = -81/(-9)
a = 9
a = 9
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