400-7+400-100=n

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Solution for 400-7+400-100=n equation: 



400-7+400-100=n

We move all terms to the left:

400-7+400-100-(n)=0

We add all the numbers together, and all the variables

-1n+693=0

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

-n=-693

n=-693/-1

n=+693

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