a+7=-6a+21

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


a in (-oo:+oo)

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

a-(-6*a)-21+7 = 0

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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