x+20+x+21=23

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Solution for x+20+x+21=23 equation: 



x+20+x+21=23

We move all terms to the left:

x+20+x+21-(23)=0

We add all the numbers together, and all the variables

2x+18=0

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

2x=-18

x=-18/2

x=-9

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