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-7=1.4k
We move all terms to the left:
-7-(1.4k)=0
We add all the numbers together, and all the variables
-(+1.4k)-7=0
We get rid of parentheses
-1.4k-7=0
We move all terms containing k to the left, all other terms to the right
-1.4k=7
k=7/-1.4
k=-5
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