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180=3n+21+2n+34
We move all terms to the left:
180-(3n+21+2n+34)=0
We add all the numbers together, and all the variables
-(5n+55)+180=0
We get rid of parentheses
-5n-55+180=0
We add all the numbers together, and all the variables
-5n+125=0
We move all terms containing n to the left, all other terms to the right
-5n=-125
n=-125/-5
n=+25
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