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9=7n+2.+20
We move all terms to the left:
9-(7n+2.+20)=0
We add all the numbers together, and all the variables
-(7n+22)+9=0
We get rid of parentheses
-7n-22+9=0
We add all the numbers together, and all the variables
-7n-13=0
We move all terms containing n to the left, all other terms to the right
-7n=13
n=13/-7
n=-1+6/7
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