0.3k+2.1=0.4k

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Solution for 0.3k+2.1=0.4k equation: 



0.3k+2.1=0.4k

We move all terms to the left:

0.3k+2.1-(0.4k)=0

We add all the numbers together, and all the variables

0.3k-(+0.4k)+2.1=0

We get rid of parentheses

0.3k-0.4k+2.1=0

We add all the numbers together, and all the variables

-0.1k+2.1=0

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

-0.1k=-2.1

k=-2.1/-0.1

k=+21

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