21-x+x+12-x+6=30

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Solution for 21-x+x+12-x+6=30 equation: 



21-x+x+12-x+6=30

We move all terms to the left:

21-x+x+12-x+6-(30)=0

We add all the numbers together, and all the variables

-1x+9=0

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

-x=-9

x=-9/-1

x=+9

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