12a-5a=(12-5)

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Solution for 12a-5a=(12-5) equation: 



12a-5a=(12-5)

We move all terms to the left:

12a-5a-((12-5))=0

We add all the numbers together, and all the variables

12a-5a-(7)=0

We add all the numbers together, and all the variables

7a-7=0

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

7a=7

a=7/7

a=1

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