2a-80=640

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Solution for 2a-80=640 equation: 



2a-80=640

We move all terms to the left:

2a-80-(640)=0

We add all the numbers together, and all the variables

2a-720=0

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

2a=720

a=720/2

a=360

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