2a+3a=9+12

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



2a+3a=9+12
We move all terms to the left:
2a+3a-(9+12)=0
We add all the numbers together, and all the variables
2a+3a-21=0
We add all the numbers together, and all the variables
5a-21=0
We move all terms containing a to the left, all other terms to the right
5a=21
a=21/5
a=4+1/5

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