x+15=4x+90

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Solution for x+15=4x+90 equation: 



x+15=4x+90

We move all terms to the left:

x+15-(4x+90)=0

We get rid of parentheses

x-4x-90+15=0

We add all the numbers together, and all the variables

-3x-75=0

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

-3x=75

x=75/-3

x=-25

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