9a-7+3a=137

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Solution for 9a-7+3a=137 equation: 



9a-7+3a=137

We move all terms to the left:

9a-7+3a-(137)=0

We add all the numbers together, and all the variables

12a-144=0

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

12a=144

a=144/12

a=12

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