3a+7+4a=12

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Solution for 3a+7+4a=12 equation: 



3a+7+4a=12

We move all terms to the left:

3a+7+4a-(12)=0

We add all the numbers together, and all the variables

7a-5=0

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

7a=5

a=5/7

a=5/7

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