(k+10)+(3k)=90

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Solution for (k+10)+(3k)=90 equation: 



(k+10)+(3k)=90

We move all terms to the left:

(k+10)+(3k)-(90)=0

We add all the numbers together, and all the variables

3k+(k+10)-90=0

We get rid of parentheses

3k+k+10-90=0

We add all the numbers together, and all the variables

4k-80=0

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

4k=80

k=80/4

k=20

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