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(9+k)=63+7k
We move all terms to the left:
(9+k)-(63+7k)=0
We add all the numbers together, and all the variables
(k+9)-(7k+63)=0
We get rid of parentheses
k-7k+9-63=0
We add all the numbers together, and all the variables
-6k-54=0
We move all terms containing k to the left, all other terms to the right
-6k=54
k=54/-6
k=-9
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