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3+(7-n)2=9
We move all terms to the left:
3+(7-n)2-(9)=0
We add all the numbers together, and all the variables
(-1n+7)2+3-9=0
We add all the numbers together, and all the variables
(-1n+7)2-6=0
We multiply parentheses
-2n+14-6=0
We add all the numbers together, and all the variables
-2n+8=0
We move all terms containing n to the left, all other terms to the right
-2n=-8
n=-8/-2
n=+4
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