3a-4+7a=13

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Solution for 3a-4+7a=13 equation: 



3a-4+7a=13

We move all terms to the left:

3a-4+7a-(13)=0

We add all the numbers together, and all the variables

10a-17=0

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

10a=17

a=17/10

a=1+7/10

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