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8-k/7=-13
We move all terms to the left:
8-k/7-(-13)=0
We add all the numbers together, and all the variables
-k/7+21=0
We multiply all the terms by the denominator
-k+21*7=0
We add all the numbers together, and all the variables
-1k+147=0
We move all terms containing k to the left, all other terms to the right
-k=-147
k=-147/-1
k=+147
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