X+(2x+6)=21

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



X+(2X+6)=21

We move all terms to the left:

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

We get rid of parentheses

X+2X+6-21=0

We add all the numbers together, and all the variables

3X-15=0

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

3X=15

X=15/3

X=5

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