3a+7+2a=42

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Solution for 3a+7+2a=42 equation: 



3a+7+2a=42

We move all terms to the left:

3a+7+2a-(42)=0

We add all the numbers together, and all the variables

5a-35=0

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

5a=35

a=35/5

a=7

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