If a =3, solve 20 + a, If a =13, solve 20 + a, If a =23, solve 20 + a, If a =15, solve 22 + a, If a =18, solve 12 + a, If a =3, solve 20 - a, If a =14, solve 20 - a, If a =15, solve 40 - a, If a =18, solve 43 - a, If a =5, solve 40 - a, 4a = 8, 2a = 12, 10a = 50, 6a = 18, 3a = 24, 5a = 30, 2a = 22, 4a = 16, 12a = 24, 10a = 100.

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