X+(X-10)+x+(x-10)=100

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Solution for X+(X-10)+x+(x-10)=100 equation: 



X+(X-10)+X+(X-10)=100

We move all terms to the left:

X+(X-10)+X+(X-10)-(100)=0

We add all the numbers together, and all the variables

2X+(X-10)+(X-10)-100=0

We get rid of parentheses

2X+X+X-10-10-100=0

We add all the numbers together, and all the variables

4X-120=0

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

4X=120

X=120/4

X=30

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