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5.8=n-21
We move all terms to the left:
5.8-(n-21)=0
We get rid of parentheses
-n+21+5.8=0
We add all the numbers together, and all the variables
-1n+26.8=0
We move all terms containing n to the left, all other terms to the right
-n=-26.8
n=-26.8/-1
n=26+0.8/1
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