11=r+(-9)

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Solution for 11=r+(-9) equation:


11=r+(-9)

We simplify the equation to the form, which is simple to understand 
11=r+(-9)

Remove unnecessary parentheses
+11=+r-9

We move all terms containing r to the left and all other terms to the right. 
-1r=-9-11

We simplify left and right side of the equation. 
-1r=-20

We divide both sides of the equation by -01 to get r. 
r=20

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