3a+7a=2

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Solution for 3a+7a=2 equation: 



3a+7a=2

We move all terms to the left:

3a+7a-(2)=0

We add all the numbers together, and all the variables

10a-2=0

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

10a=2

a=2/10

a=1/5

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