x-(90-x)=18

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Solution for x-(90-x)=18 equation: 



x-(90-x)=18

We move all terms to the left:

x-(90-x)-(18)=0

We add all the numbers together, and all the variables

x-(-1x+90)-18=0

We get rid of parentheses

x+1x-90-18=0

We add all the numbers together, and all the variables

2x-108=0

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

2x=108

x=108/2

x=54

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