2a+31=61

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Solution for 2a+31=61 equation: 



2a+31=61

We move all terms to the left:

2a+31-(61)=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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