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7.5k+55.2=15.3
We move all terms to the left:
7.5k+55.2-(15.3)=0
We add all the numbers together, and all the variables
7.5k+39.9=0
We move all terms containing k to the left, all other terms to the right
7.5k=-39.9
k=-39.9/7.5
k=-5+2.4/7.5
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