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-13=0.2k
We move all terms to the left:
-13-(0.2k)=0
We add all the numbers together, and all the variables
-(+0.2k)-13=0
We get rid of parentheses
-0.2k-13=0
We move all terms containing k to the left, all other terms to the right
-0.2k=13
k=13/-0.2
k=-65
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