x+2(x+6)=21

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Solution for x+2(x+6)=21 equation: 



x+2(x+6)=21

We move all terms to the left:

x+2(x+6)-(21)=0

We multiply parentheses

x+2x+12-21=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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