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(25+4n)-(15=3n)
We move all terms to the left:
(25+4n)-(15-(3n))=0
We add all the numbers together, and all the variables
(4n+25)-(-3n+15)=0
We get rid of parentheses
4n+3n+25-15=0
We add all the numbers together, and all the variables
7n+10=0
We move all terms containing n to the left, all other terms to the right
7n=-10
n=-10/7
n=-1+3/7
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