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4=-8+-3k
We move all terms to the left:
4-(-8+-3k)=0
We add all the numbers together, and all the variables
-(-3k)+4=0
We get rid of parentheses
3k+4=0
We move all terms containing k to the left, all other terms to the right
3k=-4
k=-4/3
k=-1+1/3
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