7a-a=42

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Solution for 7a-a=42 equation: 



7a-a=42

We move all terms to the left:

7a-a-(42)=0

We add all the numbers together, and all the variables

6a-42=0

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

6a=42

a=42/6

a=7

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