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10(9-k)=-10
We move all terms to the left:
10(9-k)-(-10)=0
We add all the numbers together, and all the variables
10(-1k+9)-(-10)=0
We add all the numbers together, and all the variables
10(-1k+9)+10=0
We multiply parentheses
-10k+90+10=0
We add all the numbers together, and all the variables
-10k+100=0
We move all terms containing k to the left, all other terms to the right
-10k=-100
k=-100/-10
k=+10
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