x+(x+20)=40

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Solution for x+(x+20)=40 equation: 



x+(x+20)=40

We move all terms to the left:

x+(x+20)-(40)=0

We get rid of parentheses

x+x+20-40=0

We add all the numbers together, and all the variables

2x-20=0

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

2x=20

x=20/2

x=10

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