2(x+6)=21-x

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



2(x+6)=21-x
We move all terms to the left:
2(x+6)-(21-x)=0
We add all the numbers together, and all the variables
2(x+6)-(-1x+21)=0
We multiply parentheses
2x-(-1x+21)+12=0
We get rid of parentheses
2x+1x-21+12=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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