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7(9+k)=18
We move all terms to the left:
7(9+k)-(18)=0
We add all the numbers together, and all the variables
7(k+9)-18=0
We multiply parentheses
7k+63-18=0
We add all the numbers together, and all the variables
7k+45=0
We move all terms containing k to the left, all other terms to the right
7k=-45
k=-45/7
k=-6+3/7
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