2a+3a+a=-42

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



2a+3a+a=-42

We move all terms to the left:

2a+3a+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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