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45n-1200=60n-1800
We move all terms to the left:
45n-1200-(60n-1800)=0
We get rid of parentheses
45n-60n+1800-1200=0
We add all the numbers together, and all the variables
-15n+600=0
We move all terms containing n to the left, all other terms to the right
-15n=-600
n=-600/-15
n=+40
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