2a-21=a-1.5

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Solution for 2a-21=a-1.5 equation: 



2a-21=a-1.5

We move all terms to the left:

2a-21-(a-1.5)=0

We get rid of parentheses

2a-a+1.5-21=0

We add all the numbers together, and all the variables

a-19.5=0

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

a=19.5

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