x+(x+1)=-21

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Solution for x+(x+1)=-21 equation: 



x+(x+1)=-21

We move all terms to the left:

x+(x+1)-(-21)=0

We add all the numbers together, and all the variables

x+(x+1)+21=0

We get rid of parentheses

x+x+1+21=0

We add all the numbers together, and all the variables

2x+22=0

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

2x=-22

x=-22/2

x=-11

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