x+2x+3(x+1)=21

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Solution for x+2x+3(x+1)=21 equation: 



x+2x+3(x+1)=21

We move all terms to the left:

x+2x+3(x+1)-(21)=0

We add all the numbers together, and all the variables

3x+3(x+1)-21=0

We multiply parentheses

3x+3x+3-21=0

We add all the numbers together, and all the variables

6x-18=0

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

6x=18

x=18/6

x=3

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