3k-k-2k+2k=18

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Solution for 3k-k-2k+2k=18 equation: 



3k-k-2k+2k=18

We move all terms to the left:

3k-k-2k+2k-(18)=0

We add all the numbers together, and all the variables

2k-18=0

We move all terms containing k to the left, all other terms to the right

2k=18

k=18/2

k=9

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