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180=4(21)+4+2(21)+11+k
We move all terms to the left:
180-(4(21)+4+2(21)+11+k)=0
We add all the numbers together, and all the variables
-(k+657)+180=0
We get rid of parentheses
-k-657+180=0
We add all the numbers together, and all the variables
-1k-477=0
We move all terms containing k to the left, all other terms to the right
-k=477
k=477/-1
k=-477
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