X-(90-x)=20

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Solution for X-(90-x)=20 equation: 



X-(90-X)=20

We move all terms to the left:

X-(90-X)-(20)=0

We add all the numbers together, and all the variables

X-(-1X+90)-20=0

We get rid of parentheses

X+1X-90-20=0

We add all the numbers together, and all the variables

2X-110=0

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

2X=110

X=110/2

X=55

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