x+(x+9)=45

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Solution for x+(x+9)=45 equation: 



x+(x+9)=45

We move all terms to the left:

x+(x+9)-(45)=0

We get rid of parentheses

x+x+9-45=0

We add all the numbers together, and all the variables

2x-36=0

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

2x=36

x=36/2

x=18

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