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6-5n+3n=21-45
We move all terms to the left:
6-5n+3n-(21-45)=0
We add all the numbers together, and all the variables
-5n+3n+6-(-24)=0
We add all the numbers together, and all the variables
-2n+30=0
We move all terms containing n to the left, all other terms to the right
-2n=-30
n=-30/-2
n=+15
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