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

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Solution for 6(x+2x)+3x=21 equation: 



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

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

We multiply parentheses

3x+18x-21=0

We add all the numbers together, and all the variables

21x-21=0

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

21x=21

x=21/21

x=1

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