-n+4.2-6n+2.8=21

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Solution for -n+4.2-6n+2.8=21 equation: 



-n+4.2-6n+2.8=21

We move all terms to the left:

-n+4.2-6n+2.8-(21)=0

We add all the numbers together, and all the variables

-7n-14=0

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

-7n=14

n=14/-7

n=-2

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