3x+x+(x-400)=3120

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Solution for 3x+x+(x-400)=3120 equation: 



3x+x+(x-400)=3120

We move all terms to the left:

3x+x+(x-400)-(3120)=0

We add all the numbers together, and all the variables

4x+(x-400)-3120=0

We get rid of parentheses

4x+x-400-3120=0

We add all the numbers together, and all the variables

5x-3520=0

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

5x=3520

x=3520/5

x=704

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