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-126=9-9n
We move all terms to the left:
-126-(9-9n)=0
We add all the numbers together, and all the variables
-(-9n+9)-126=0
We get rid of parentheses
9n-9-126=0
We add all the numbers together, and all the variables
9n-135=0
We move all terms containing n to the left, all other terms to the right
9n=135
n=135/9
n=15
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