x+20x+10x=90

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Solution for x+20x+10x=90 equation: 



x+20x+10x=90

We move all terms to the left:

x+20x+10x-(90)=0

We add all the numbers together, and all the variables

31x-90=0

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

31x=90

x=90/31

x=2+28/31

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