21=43-2r

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Solution for 21=43-2r equation:


21=43-2r

We simplify the equation to the form, which is simple to understand 
21=43-2r

We move all terms containing r to the left and all other terms to the right. 
+2r=+43-21

We simplify left and right side of the equation. 
+2r=+22

We divide both sides of the equation by 02 to get r. 
r=11

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