10n+100=400

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Solution for 10n+100=400 equation: 



10n+100=400

We move all terms to the left:

10n+100-(400)=0

We add all the numbers together, and all the variables

10n-300=0

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

10n=300

n=300/10

n=30

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