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-15=n-1+6n
We move all terms to the left:
-15-(n-1+6n)=0
We add all the numbers together, and all the variables
-(7n-1)-15=0
We get rid of parentheses
-7n+1-15=0
We add all the numbers together, and all the variables
-7n-14=0
We move all terms containing n to the left, all other terms to the right
-7n=14
n=14/-7
n=-2
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