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4=19-3k
We move all terms to the left:
4-(19-3k)=0
We add all the numbers together, and all the variables
-(-3k+19)+4=0
We get rid of parentheses
3k-19+4=0
We add all the numbers together, and all the variables
3k-15=0
We move all terms containing k to the left, all other terms to the right
3k=15
k=15/3
k=5
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