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9=19+k
We move all terms to the left:
9-(19+k)=0
We add all the numbers together, and all the variables
-(k+19)+9=0
We get rid of parentheses
-k-19+9=0
We add all the numbers together, and all the variables
-1k-10=0
We move all terms containing k to the left, all other terms to the right
-k=10
k=10/-1
k=-10
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