x+(x+3)+(x-6)=21

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Solution for x+(x+3)+(x-6)=21 equation: 



x+(x+3)+(x-6)=21

We move all terms to the left:

x+(x+3)+(x-6)-(21)=0

We get rid of parentheses

x+x+x+3-6-21=0

We add all the numbers together, and all the variables

3x-24=0

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

3x=24

x=24/3

x=8

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