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-7(3n+9)=15n
We move all terms to the left:
-7(3n+9)-(15n)=0
We add all the numbers together, and all the variables
-15n-7(3n+9)=0
We multiply parentheses
-15n-21n-63=0
We add all the numbers together, and all the variables
-36n-63=0
We move all terms containing n to the left, all other terms to the right
-36n=63
n=63/-36
n=-1+3/4
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