3a+9=2a+12

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Solution for 3a+9=2a+12 equation: 



3a+9=2a+12

We move all terms to the left:

3a+9-(2a+12)=0

We get rid of parentheses

3a-2a-12+9=0

We add all the numbers together, and all the variables

a-3=0

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

a=3

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