18+9a=3a+42

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Solution for 18+9a=3a+42 equation: 



18+9a=3a+42

We move all terms to the left:

18+9a-(3a+42)=0

We get rid of parentheses

9a-3a-42+18=0

We add all the numbers together, and all the variables

6a-24=0

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

6a=24

a=24/6

a=4

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