7+3a=-2

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Solution for 7+3a=-2 equation: 



7+3a=-2

We move all terms to the left:

7+3a-(-2)=0

We add all the numbers together, and all the variables

3a+9=0

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

3a=-9

a=-9/3

a=-3

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