20x+10x=420

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Solution for 20x+10x=420 equation: 



20x+10x=420

We move all terms to the left:

20x+10x-(420)=0

We add all the numbers together, and all the variables

30x-420=0

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

30x=420

x=420/30

x=14

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