10n+3-12n=21

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Solution for 10n+3-12n=21 equation: 



10n+3-12n=21

We move all terms to the left:

10n+3-12n-(21)=0

We add all the numbers together, and all the variables

-2n-18=0

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

-2n=18

n=18/-2

n=-9

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