3x+x=520

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Solution for 3x+x=520 equation: 



3x+x=520

We move all terms to the left:

3x+x-(520)=0

We add all the numbers together, and all the variables

4x-520=0

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

4x=520

x=520/4

x=130

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