X+9+x-9=180

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Solution for X+9+x-9=180 equation: 



X+9+X-9=180

We move all terms to the left:

X+9+X-9-(180)=0

We add all the numbers together, and all the variables

2X-180=0

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

2X=180

X=180/2

X=90

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