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-25=-5-5k
We move all terms to the left:
-25-(-5-5k)=0
We add all the numbers together, and all the variables
-(-5k-5)-25=0
We get rid of parentheses
5k+5-25=0
We add all the numbers together, and all the variables
5k-20=0
We move all terms containing k to the left, all other terms to the right
5k=20
k=20/5
k=4
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