31.8=38.72+23.19-a

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Solution for 31.8=38.72+23.19-a equation: 



31.8=38.72+23.19-a

We move all terms to the left:

31.8-(38.72+23.19-a)=0

We add all the numbers together, and all the variables

-(-1a+61.91)+31.8=0

We get rid of parentheses

1a-61.91+31.8=0

We add all the numbers together, and all the variables

a-30.11=0

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

a=30.11

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