3a-9=39-a

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Solution for 3a-9=39-a equation: 


a in (-oo:+oo)

3*a-9 = 39-a // - 39-a

3*a+a-39-9 = 0

4*a-48 = 0 // + 48

4*a = 48 // : 4

a = 48/4

a = 12

a = 12

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