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180*45/n=900
We move all terms to the left:
180*45/n-(900)=0
Domain of the equation: n!=0We multiply all the terms by the denominator
n∈R
-900*n+180*45=0
We add all the numbers together, and all the variables
-900n+8100=0
We move all terms containing n to the left, all other terms to the right
-900n=-8100
n=-8100/-900
n=+9
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