520=75x+55x

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Solution for 520=75x+55x equation: 



520=75x+55x

We move all terms to the left:

520-(75x+55x)=0

We add all the numbers together, and all the variables

-(+130x)+520=0

We get rid of parentheses

-130x+520=0

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

-130x=-520

x=-520/-130

x=+4

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