-x+3-x=-21

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



-x+3-x=-21

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x+24=0

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

-2x=-24

x=-24/-2

x=+12

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