x+(18+x)=42

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Solution for x+(18+x)=42 equation: 



x+(18+x)=42

We move all terms to the left:

x+(18+x)-(42)=0

We add all the numbers together, and all the variables

x+(x+18)-42=0

We get rid of parentheses

x+x+18-42=0

We add all the numbers together, and all the variables

2x-24=0

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

2x=24

x=24/2

x=12

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