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0.5k+0.9-0.4k=5.1-0.5k
We move all terms to the left:
0.5k+0.9-0.4k-(5.1-0.5k)=0
We add all the numbers together, and all the variables
0.5k-0.4k-(-0.5k+5.1)+0.9=0
We add all the numbers together, and all the variables
0.1k-(-0.5k+5.1)+0.9=0
We get rid of parentheses
0.1k+0.5k-5.1+0.9=0
We add all the numbers together, and all the variables
0.6k-4.2=0
We move all terms containing k to the left, all other terms to the right
0.6k=4.2
k=4.2/0.6
k=7
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