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9(7k-5)=-45+63k
We move all terms to the left:
9(7k-5)-(-45+63k)=0
We add all the numbers together, and all the variables
9(7k-5)-(63k-45)=0
We multiply parentheses
63k-(63k-45)-45=0
We get rid of parentheses
63k-63k+45-45=0
We add all the numbers together, and all the variables
=0
k=0/1
k=0
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