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45=7+2n
We move all terms to the left:
45-(7+2n)=0
We add all the numbers together, and all the variables
-(2n+7)+45=0
We get rid of parentheses
-2n-7+45=0
We add all the numbers together, and all the variables
-2n+38=0
We move all terms containing n to the left, all other terms to the right
-2n=-38
n=-38/-2
n=+19
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