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-50=3n+7
We move all terms to the left:
-50-(3n+7)=0
We get rid of parentheses
-3n-7-50=0
We add all the numbers together, and all the variables
-3n-57=0
We move all terms containing n to the left, all other terms to the right
-3n=57
n=57/-3
n=-19
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