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0.8+0.8k=0.6k=0.9
We move all terms to the left:
0.8+0.8k-(0.6k)=0
We add all the numbers together, and all the variables
0.8k-(+0.6k)+0.8=0
We get rid of parentheses
0.8k-0.6k+0.8=0
We add all the numbers together, and all the variables
0.2k+0.8=0
We move all terms containing k to the left, all other terms to the right
0.2k=-0.8
k=-0.8/0.2
k=-4
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