(x-90)=4x

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



(x-90)=4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

-4x+(x-90)=0

We get rid of parentheses

-4x+x-90=0

We add all the numbers together, and all the variables

-3x-90=0

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

-3x=90

x=90/-3

x=-30

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