31+a=2a+12

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Solution for 31+a=2a+12 equation: 



31+a=2a+12

We move all terms to the left:

31+a-(2a+12)=0

We get rid of parentheses

a-2a-12+31=0

We add all the numbers together, and all the variables

-1a+19=0

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

-a=-19

a=-19/-1

a=+19

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