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-7(2k+3)=3k
We move all terms to the left:
-7(2k+3)-(3k)=0
We add all the numbers together, and all the variables
-3k-7(2k+3)=0
We multiply parentheses
-3k-14k-21=0
We add all the numbers together, and all the variables
-17k-21=0
We move all terms containing k to the left, all other terms to the right
-17k=21
k=21/-17
k=-1+4/17
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