2a+(a+3)=30

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Solution for 2a+(a+3)=30 equation: 



2a+(a+3)=30

We move all terms to the left:

2a+(a+3)-(30)=0

We get rid of parentheses

2a+a+3-30=0

We add all the numbers together, and all the variables

3a-27=0

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

3a=27

a=27/3

a=9

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