640=a+2.5

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Solution for 640=a+2.5 equation: 



640=a+2.5

We move all terms to the left:

640-(a+2.5)=0

We get rid of parentheses

-a-2.5+640=0

We add all the numbers together, and all the variables

-1a+637.5=0

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

-a=-637.5

a=-637.5/-1

a=637+0.5/1

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