100=20-5k

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Solution for 100=20-5k equation: 



100=20-5k

We move all terms to the left:

100-(20-5k)=0

We add all the numbers together, and all the variables

-(-5k+20)+100=0

We get rid of parentheses

5k-20+100=0

We add all the numbers together, and all the variables

5k+80=0

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

5k=-80

k=-80/5

k=-16

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