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-19=-k+1-3k
We move all terms to the left:
-19-(-k+1-3k)=0
We add all the numbers together, and all the variables
-(-4k+1)-19=0
We get rid of parentheses
4k-1-19=0
We add all the numbers together, and all the variables
4k-20=0
We move all terms containing k to the left, all other terms to the right
4k=20
k=20/4
k=5
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