30k+90=20k+10

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Solution for 30k+90=20k+10 equation: 



30k+90=20k+10

We move all terms to the left:

30k+90-(20k+10)=0

We get rid of parentheses

30k-20k-10+90=0

We add all the numbers together, and all the variables

10k+80=0

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

10k=-80

k=-80/10

k=-8

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