20x+10x=900

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Solution for 20x+10x=900 equation: 



20x+10x=900

We move all terms to the left:

20x+10x-(900)=0

We add all the numbers together, and all the variables

30x-900=0

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

30x=900

x=900/30

x=30

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