(13a)=(a+72)

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Solution for (13a)=(a+72) equation: 



(13a)=(a+72)

We move all terms to the left:

(13a)-((a+72))=0



We calculate terms in parentheses: -((a+72)), so:

(a+72)

We get rid of parentheses

a+72

Back to the equation:

-(a+72)



We get rid of parentheses

13a-a-72=0

We add all the numbers together, and all the variables

12a-72=0

We move all terms containing a to the left, all other terms to the right

12a=72

a=72/12

a=6

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