x-19=-x+21

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Solution for x-19=-x+21 equation: 



x-19=-x+21

We move all terms to the left:

x-19-(-x+21)=0

We add all the numbers together, and all the variables

x-(-1x+21)-19=0

We get rid of parentheses

x+1x-21-19=0

We add all the numbers together, and all the variables

2x-40=0

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

2x=40

x=40/2

x=20

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