6x+12x=420

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Solution for 6x+12x=420 equation: 



6x+12x=420

We move all terms to the left:

6x+12x-(420)=0

We add all the numbers together, and all the variables

18x-420=0

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

18x=420

x=420/18

x=23+1/3

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