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3.5=1+20k
We move all terms to the left:
3.5-(1+20k)=0
We add all the numbers together, and all the variables
-(20k+1)+3.5=0
We get rid of parentheses
-20k-1+3.5=0
We add all the numbers together, and all the variables
-20k+2.5=0
We move all terms containing k to the left, all other terms to the right
-20k=-2.5
k=-2.5/-20
k=1/8
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