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138.5/180=n
We move all terms to the left:
138.5/180-(n)=0
We add all the numbers together, and all the variables
-1n+138.5/180=0
We multiply all the terms by the denominator
-1n*180+138.5=0
Wy multiply elements
-180n+138.5=0
We move all terms containing n to the left, all other terms to the right
-180n=-138.5
n=-138.5/-180
n=21.307692307692/27.692307692308
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