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45=6n-45
We move all terms to the left:
45-(6n-45)=0
We get rid of parentheses
-6n+45+45=0
We add all the numbers together, and all the variables
-6n+90=0
We move all terms containing n to the left, all other terms to the right
-6n=-90
n=-90/-6
n=+15
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