x+6x=420

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Solution for x+6x=420 equation: 



x+6x=420

We move all terms to the left:

x+6x-(420)=0

We add all the numbers together, and all the variables

7x-420=0

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

7x=420

x=420/7

x=60

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