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-13=-4+k
We move all terms to the left:
-13-(-4+k)=0
We add all the numbers together, and all the variables
-(k-4)-13=0
We get rid of parentheses
-k+4-13=0
We add all the numbers together, and all the variables
-1k-9=0
We move all terms containing k to the left, all other terms to the right
-k=9
k=9/-1
k=-9
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