-x+21=-10

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Solution for -x+21=-10 equation: 



-x+21=-10

We move all terms to the left:

-x+21-(-10)=0

We add all the numbers together, and all the variables

-1x+31=0

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

-x=-31

x=-31/-1

x=+31

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