X+x-20+9=90

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Solution for X+x-20+9=90 equation: 



X+X-20+9=90

We move all terms to the left:

X+X-20+9-(90)=0

We add all the numbers together, and all the variables

2X-101=0

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

2X=101

X=101/2

X=50+1/2

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