18a-21=15a-3

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Solution for 18a-21=15a-3 equation: 



18a-21=15a-3

We move all terms to the left:

18a-21-(15a-3)=0

We get rid of parentheses

18a-15a+3-21=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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