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40=4n+4
We move all terms to the left:
40-(4n+4)=0
We get rid of parentheses
-4n-4+40=0
We add all the numbers together, and all the variables
-4n+36=0
We move all terms containing n to the left, all other terms to the right
-4n=-36
n=-36/-4
n=+9
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