X+x-4=40

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Solution for X+x-4=40 equation: 



X+X-4=40

We move all terms to the left:

X+X-4-(40)=0

We add all the numbers together, and all the variables

2X-44=0

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

2X=44

X=44/2

X=22

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