X+20+x-30=230

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Solution for X+20+x-30=230 equation: 



X+20+X-30=230

We move all terms to the left:

X+20+X-30-(230)=0

We add all the numbers together, and all the variables

2X-240=0

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

2X=240

X=240/2

X=120

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