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2k+2k-4+2k+3k=15
We move all terms to the left:
2k+2k-4+2k+3k-(15)=0
We add all the numbers together, and all the variables
9k-19=0
We move all terms containing k to the left, all other terms to the right
9k=19
k=19/9
k=2+1/9
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