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-535+4.50n=12n
We move all terms to the left:
-535+4.50n-(12n)=0
We add all the numbers together, and all the variables
-7.5n-535=0
We move all terms containing n to the left, all other terms to the right
-7.5n=535
n=535/-7.5
n=-71+2.5/7.5
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