13x+20x+21=90

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Solution for 13x+20x+21=90 equation: 



13x+20x+21=90

We move all terms to the left:

13x+20x+21-(90)=0

We add all the numbers together, and all the variables

33x-69=0

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

33x=69

x=69/33

x=2+1/11

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