a+3(7a+6)=216

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Solution for a+3(7a+6)=216 equation: 



a+3(7a+6)=216

We move all terms to the left:

a+3(7a+6)-(216)=0

We multiply parentheses

a+21a+18-216=0

We add all the numbers together, and all the variables

22a-198=0

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

22a=198

a=198/22

a=9

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