(90-k)=4k

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Solution for (90-k)=4k equation: 



(90-k)=4k

We move all terms to the left:

(90-k)-(4k)=0

We add all the numbers together, and all the variables

(-1k+90)-4k=0

We add all the numbers together, and all the variables

-4k+(-1k+90)=0

We get rid of parentheses

-4k-1k+90=0

We add all the numbers together, and all the variables

-5k+90=0

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

-5k=-90

k=-90/-5

k=+18

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