10k-10k+k+2k+k=20

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Solution for 10k-10k+k+2k+k=20 equation: 



10k-10k+k+2k+k=20

We move all terms to the left:

10k-10k+k+2k+k-(20)=0

We add all the numbers together, and all the variables

4k-20=0

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

4k=20

k=20/4

k=5

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