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8k+3=10k+9
We move all terms to the left:
8k+3-(10k+9)=0
We get rid of parentheses
8k-10k-9+3=0
We add all the numbers together, and all the variables
-2k-6=0
We move all terms containing k to the left, all other terms to the right
-2k=6
k=6/-2
k=-3
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