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25=3n+1+3n
We move all terms to the left:
25-(3n+1+3n)=0
We add all the numbers together, and all the variables
-(6n+1)+25=0
We get rid of parentheses
-6n-1+25=0
We add all the numbers together, and all the variables
-6n+24=0
We move all terms containing n to the left, all other terms to the right
-6n=-24
n=-24/-6
n=+4
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