X+x-88=90

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Solution for X+x-88=90 equation: 



X+X-88=90

We move all terms to the left:

X+X-88-(90)=0

We add all the numbers together, and all the variables

2X-178=0

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

2X=178

X=178/2

X=89

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