30k+100=20k+400

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Solution for 30k+100=20k+400 equation: 



30k+100=20k+400

We move all terms to the left:

30k+100-(20k+400)=0

We get rid of parentheses

30k-20k-400+100=0

We add all the numbers together, and all the variables

10k-300=0

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

10k=300

k=300/10

k=30

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