6a+3=4a+21

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Solution for 6a+3=4a+21 equation: 



6a+3=4a+21

We move all terms to the left:

6a+3-(4a+21)=0

We get rid of parentheses

6a-4a-21+3=0

We add all the numbers together, and all the variables

2a-18=0

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

2a=18

a=18/2

a=9

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