31-12a=211

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Solution for 31-12a=211 equation: 



31-12a=211

We move all terms to the left:

31-12a-(211)=0

We add all the numbers together, and all the variables

-12a-180=0

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

-12a=180

a=180/-12

a=-15

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