21-x=21-13

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Solution for 21-x=21-13 equation: 



21-x=21-13

We move all terms to the left:

21-x-(21-13)=0

We add all the numbers together, and all the variables

-x+21-8=0

We add all the numbers together, and all the variables

-1x+13=0

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

-x=-13

x=-13/-1

x=+13

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