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7k-(-3k)-5k=-9
We move all terms to the left:
7k-(-3k)-5k-(-9)=0
We add all the numbers together, and all the variables
2k-(-3k)+9=0
We get rid of parentheses
2k+3k+9=0
We add all the numbers together, and all the variables
5k+9=0
We move all terms containing k to the left, all other terms to the right
5k=-9
k=-9/5
k=-1+4/5
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