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-2n+14=5n-21
We move all terms to the left:
-2n+14-(5n-21)=0
We get rid of parentheses
-2n-5n+21+14=0
We add all the numbers together, and all the variables
-7n+35=0
We move all terms containing n to the left, all other terms to the right
-7n=-35
n=-35/-7
n=+5
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