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10=-12k+2k
We move all terms to the left:
10-(-12k+2k)=0
We add all the numbers together, and all the variables
-(-10k)+10=0
We get rid of parentheses
10k+10=0
We move all terms containing k to the left, all other terms to the right
10k=-10
k=-10/10
k=-1
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