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k-10=-9+2k
We move all terms to the left:
k-10-(-9+2k)=0
We add all the numbers together, and all the variables
k-(2k-9)-10=0
We get rid of parentheses
k-2k+9-10=0
We add all the numbers together, and all the variables
-1k-1=0
We move all terms containing k to the left, all other terms to the right
-k=1
k=1/-1
k=-1
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