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180=45+k+2k
We move all terms to the left:
180-(45+k+2k)=0
We add all the numbers together, and all the variables
-(3k+45)+180=0
We get rid of parentheses
-3k-45+180=0
We add all the numbers together, and all the variables
-3k+135=0
We move all terms containing k to the left, all other terms to the right
-3k=-135
k=-135/-3
k=+45
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