a+7=21-6a

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Solution for a+7=21-6a equation: 


a in (-oo:+oo)

a+7 = 21-(6*a) // - 21-(6*a)

a+6*a-21+7 = 0

7*a-14 = 0 // + 14

7*a = 14 // : 7

a = 14/7

a = 2

a = 2

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