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0.9=k/0.2
We move all terms to the left:
0.9-(k/0.2)=0
We add all the numbers together, and all the variables
-(+k/0.2)+0.9=0
We get rid of parentheses
-k/0.2+0.9=0
We multiply all the terms by the denominator
-k+(0.9)*0.2=0
We add all the numbers together, and all the variables
-1k+0.18=0
We move all terms containing k to the left, all other terms to the right
-k=-0.18
k=-0.18/-1
k=0.18/1
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