21-r=19

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Solution for 21-r=19 equation:


21-r=19

We simplify the equation to the form, which is simple to understand 
21-r=19

We move all terms containing r to the left and all other terms to the right. 
-1r=+19-21

We simplify left and right side of the equation. 
-1r=-2

We divide both sides of the equation by -1 to get r. 
r=2

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