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20.5=3k+10
We move all terms to the left:
20.5-(3k+10)=0
We get rid of parentheses
-3k-10+20.5=0
We add all the numbers together, and all the variables
-3k+10.5=0
We move all terms containing k to the left, all other terms to the right
-3k=-10.5
k=-10.5/-3
k=3+1/2
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