20+x+2x+1=90

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Solution for 20+x+2x+1=90 equation: 



20+x+2x+1=90

We move all terms to the left:

20+x+2x+1-(90)=0

We add all the numbers together, and all the variables

3x-69=0

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

3x=69

x=69/3

x=23

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