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2.1k+3=7.2
We move all terms to the left:
2.1k+3-(7.2)=0
We add all the numbers together, and all the variables
2.1k-4.2=0
We move all terms containing k to the left, all other terms to the right
2.1k=4.2
k=4.2/2.1
k=2
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