18a-42=15a-18

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Solution for 18a-42=15a-18 equation: 



18a-42=15a-18

We move all terms to the left:

18a-42-(15a-18)=0

We get rid of parentheses

18a-15a+18-42=0

We add all the numbers together, and all the variables

3a-24=0

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

3a=24

a=24/3

a=8

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