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10-2k=-4k-10
We move all terms to the left:
10-2k-(-4k-10)=0
We get rid of parentheses
-2k+4k+10+10=0
We add all the numbers together, and all the variables
2k+20=0
We move all terms containing k to the left, all other terms to the right
2k=-20
k=-20/2
k=-10
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