400(a-9)=800

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Solution for 400(a-9)=800 equation: 



400(a-9)=800

We move all terms to the left:

400(a-9)-(800)=0

We multiply parentheses

400a-3600-800=0

We add all the numbers together, and all the variables

400a-4400=0

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

400a=4400

a=4400/400

a=11

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