3a-a=-30

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Solution for 3a-a=-30 equation: 



3a-a=-30

We move all terms to the left:

3a-a-(-30)=0

We add all the numbers together, and all the variables

2a+30=0

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

2a=-30

a=-30/2

a=-15

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