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2k+3=6.4
We move all terms to the left:
2k+3-(6.4)=0
We add all the numbers together, and all the variables
2k-3.4=0
We move all terms containing k to the left, all other terms to the right
2k=3.4
k=3.4/2
k=1+1/1.4285714285714
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