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19=4n+5
We move all terms to the left:
19-(4n+5)=0
We get rid of parentheses
-4n-5+19=0
We add all the numbers together, and all the variables
-4n+14=0
We move all terms containing n to the left, all other terms to the right
-4n=-14
n=-14/-4
n=3+1/2
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