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6=k+2.5
We move all terms to the left:
6-(k+2.5)=0
We get rid of parentheses
-k-2.5+6=0
We add all the numbers together, and all the variables
-1k+3.5=0
We move all terms containing k to the left, all other terms to the right
-k=-3.5
k=-3.5/-1
k=3+0.5/1
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