3x+6x=21-2x

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Solution for 3x+6x=21-2x equation:



3x+6x=21-2x
We move all terms to the left:
3x+6x-(21-2x)=0
We add all the numbers together, and all the variables
3x+6x-(-2x+21)=0
We add all the numbers together, and all the variables
9x-(-2x+21)=0
We get rid of parentheses
9x+2x-21=0
We add all the numbers together, and all the variables
11x-21=0
We move all terms containing x to the left, all other terms to the right
11x=21
x=21/11
x=1+10/11

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