9+6a+6a=69

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Solution for 9+6a+6a=69 equation: 


a in (-oo:+oo)

6*a+6*a+9 = 69 // - 69

6*a+6*a-69+9 = 0

12*a-60 = 0 // + 60

12*a = 60 // : 12

a = 60/12

a = 5

a = 5

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