2a+1+3a=-12

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Solution for 2a+1+3a=-12 equation: 



2a+1+3a=-12

We move all terms to the left:

2a+1+3a-(-12)=0

We add all the numbers together, and all the variables

5a+13=0

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

5a=-13

a=-13/5

a=-2+3/5

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