315=25x-4x

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Solution for 315=25x-4x equation: 



315=25x-4x

We move all terms to the left:

315-(25x-4x)=0

We add all the numbers together, and all the variables

-(+21x)+315=0

We get rid of parentheses

-21x+315=0

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

-21x=-315

x=-315/-21

x=+15

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