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k/9+0.9=-21.5
We move all terms to the left:
k/9+0.9-(-21.5)=0
We add all the numbers together, and all the variables
k/9+22.4=0
We multiply all the terms by the denominator
k+(22.4)*9=0
We add all the numbers together, and all the variables
k+201.6=0
We move all terms containing k to the left, all other terms to the right
k=-201.6
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