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55=36+k
We move all terms to the left:
55-(36+k)=0
We add all the numbers together, and all the variables
-(k+36)+55=0
We get rid of parentheses
-k-36+55=0
We add all the numbers together, and all the variables
-1k+19=0
We move all terms containing k to the left, all other terms to the right
-k=-19
k=-19/-1
k=+19
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