(x+4x=90)

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Solution for (x+4x=90) equation: 



(x+4x=90)

We move all terms to the left:

(x+4x-(90))=0

We add all the numbers together, and all the variables

(5x-90)=0

We get rid of parentheses

5x-90=0

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

5x=90

x=90/5

x=18

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