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5+(-3k)=20
We move all terms to the left:
5+(-3k)-(20)=0
We add all the numbers together, and all the variables
(-3k)-15=0
We get rid of parentheses
-3k-15=0
We move all terms containing k to the left, all other terms to the right
-3k=15
k=15/-3
k=-5
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