3a-7+a=5

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Solution for 3a-7+a=5 equation: 



3a-7+a=5

We move all terms to the left:

3a-7+a-(5)=0

We add all the numbers together, and all the variables

4a-12=0

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

4a=12

a=12/4

a=3

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