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0.004(5-k)+0.09(k-4)=1
We move all terms to the left:
0.004(5-k)+0.09(k-4)-(1)=0
We add all the numbers together, and all the variables
0.004(-1k+5)+0.09(k-4)-1=0
We multiply parentheses
-0.004k+0.09k+0.02-0.36-1=0
We add all the numbers together, and all the variables
0.086k-1.34=0
We move all terms containing k to the left, all other terms to the right
0.086k=1.34
k=1.34/0.086
k=15+0.05/0.086
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