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(5-2n)=7
We move all terms to the left:
(5-2n)-(7)=0
We add all the numbers together, and all the variables
(-2n+5)-7=0
We get rid of parentheses
-2n+5-7=0
We add all the numbers together, and all the variables
-2n-2=0
We move all terms containing n to the left, all other terms to the right
-2n=2
n=2/-2
n=-1
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