x+90=4x+15

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



x+90=4x+15

We move all terms to the left:

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

We get rid of parentheses

x-4x-15+90=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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