10n-30=7n-21

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Solution for 10n-30=7n-21 equation: 



10n-30=7n-21

We move all terms to the left:

10n-30-(7n-21)=0

We get rid of parentheses

10n-7n+21-30=0

We add all the numbers together, and all the variables

3n-9=0

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

3n=9

n=9/3

n=3

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