3a+a=a+18

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Solution for 3a+a=a+18 equation: 



3a+a=a+18

We move all terms to the left:

3a+a-(a+18)=0

We add all the numbers together, and all the variables

4a-(a+18)=0

We get rid of parentheses

4a-a-18=0

We add all the numbers together, and all the variables

3a-18=0

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

3a=18

a=18/3

a=6

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