21-x=-19

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Solution for 21-x=-19 equation: 



21-x=-19

We move all terms to the left:

21-x-(-19)=0

We add all the numbers together, and all the variables

-1x+40=0

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

-x=-40

x=-40/-1

x=+40

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