10k+90=120

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Solution for 10k+90=120 equation: 



10k+90=120

We move all terms to the left:

10k+90-(120)=0

We add all the numbers together, and all the variables

10k-30=0

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

10k=30

k=30/10

k=3

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