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-7.78=k-19.78
We move all terms to the left:
-7.78-(k-19.78)=0
We get rid of parentheses
-k+19.78-7.78=0
We add all the numbers together, and all the variables
-1k+12=0
We move all terms containing k to the left, all other terms to the right
-k=-12
k=-12/-1
k=+12
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