3+7a=129

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Solution for 3+7a=129 equation: 



3+7a=129

We move all terms to the left:

3+7a-(129)=0

We add all the numbers together, and all the variables

7a-126=0

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

7a=126

a=126/7

a=18

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