3x+x+3x+x=400

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Solution for 3x+x+3x+x=400 equation: 



3x+x+3x+x=400

We move all terms to the left:

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

We add all the numbers together, and all the variables

8x-400=0

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

8x=400

x=400/8

x=50

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