x+3x=507

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Solution for x+3x=507 equation: 



x+3x=507

We move all terms to the left:

x+3x-(507)=0

We add all the numbers together, and all the variables

4x-507=0

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

4x=507

x=507/4

x=126+3/4

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