12+a=4+9

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Solution for 12+a=4+9 equation: 



12+a=4+9

We move all terms to the left:

12+a-(4+9)=0

We add all the numbers together, and all the variables

a+12-13=0

We add all the numbers together, and all the variables

a-1=0

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

a=1

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