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3.15=0.45n.
We move all terms to the left:
3.15-(0.45n.)=0
We add all the numbers together, and all the variables
-(+0.45n.)+3.15=0
We get rid of parentheses
-0.45n.+3.15=0
We move all terms containing n to the left, all other terms to the right
-0.45n.=-3.15
n=-3.15/1
n=-3.15
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