67=21-x+12-x

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Solution for 67=21-x+12-x equation: 



67=21-x+12-x

We move all terms to the left:

67-(21-x+12-x)=0

We add all the numbers together, and all the variables

-(-2x+33)+67=0

We get rid of parentheses

2x-33+67=0

We add all the numbers together, and all the variables

2x+34=0

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

2x=-34

x=-34/2

x=-17

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