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-2k+9=-9+k
We move all terms to the left:
-2k+9-(-9+k)=0
We add all the numbers together, and all the variables
-2k-(k-9)+9=0
We get rid of parentheses
-2k-k+9+9=0
We add all the numbers together, and all the variables
-3k+18=0
We move all terms containing k to the left, all other terms to the right
-3k=-18
k=-18/-3
k=+6
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