9x+x+9x+x=420

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Solution for 9x+x+9x+x=420 equation: 



9x+x+9x+x=420

We move all terms to the left:

9x+x+9x+x-(420)=0

We add all the numbers together, and all the variables

20x-420=0

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

20x=420

x=420/20

x=21

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