90+X+20+2x-20=180

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Solution for 90+X+20+2x-20=180 equation: 



90+X+20+2X-20=180

We move all terms to the left:

90+X+20+2X-20-(180)=0

We add all the numbers together, and all the variables

3X-90=0

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

3X=90

X=90/3

X=30

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