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305=400k-175
We move all terms to the left:
305-(400k-175)=0
We get rid of parentheses
-400k+175+305=0
We add all the numbers together, and all the variables
-400k+480=0
We move all terms containing k to the left, all other terms to the right
-400k=-480
k=-480/-400
k=1+1/5
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