2a-19.9=a+2.1=a-2.5=19.5

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Solution for 2a-19.9=a+2.1=a-2.5=19.5 equation: 



2a-19.9=a+2.1=a-2.5=19.5

We move all terms to the left:

2a-19.9-(a+2.1)=0

We get rid of parentheses

2a-a-2.1-19.9=0

We add all the numbers together, and all the variables

a-22=0

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

a=22

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