18-x=-21

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Solution for 18-x=-21 equation: 



18-x=-21

We move all terms to the left:

18-x-(-21)=0

We add all the numbers together, and all the variables

-1x+39=0

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

-x=-39

x=-39/-1

x=+39

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