X+x+(x-4)+(x-4)=20

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Solution for X+x+(x-4)+(x-4)=20 equation: 



X+X+(X-4)+(X-4)=20

We move all terms to the left:

X+X+(X-4)+(X-4)-(20)=0

We add all the numbers together, and all the variables

2X+(X-4)+(X-4)-20=0

We get rid of parentheses

2X+X+X-4-4-20=0

We add all the numbers together, and all the variables

4X-28=0

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

4X=28

X=28/4

X=7

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