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0.004(4-k)+0.05(k-4)=1
We move all terms to the left:
0.004(4-k)+0.05(k-4)-(1)=0
We add all the numbers together, and all the variables
0.004(-1k+4)+0.05(k-4)-1=0
We multiply parentheses
-0.004k+0.05k+0.016-0.2-1=0
We add all the numbers together, and all the variables
0.046k-1.184=0
We move all terms containing k to the left, all other terms to the right
0.046k=1.184
k=1.184/0.046
k=25+0.034/0.046
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