90+x+x-20=180

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Solution for 90+x+x-20=180 equation: 



90+x+x-20=180

We move all terms to the left:

90+x+x-20-(180)=0

We add all the numbers together, and all the variables

2x-110=0

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

2x=110

x=110/2

x=55

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