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3(2+3k)=78
We move all terms to the left:
3(2+3k)-(78)=0
We add all the numbers together, and all the variables
3(3k+2)-78=0
We multiply parentheses
9k+6-78=0
We add all the numbers together, and all the variables
9k-72=0
We move all terms containing k to the left, all other terms to the right
9k=72
k=72/9
k=8
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