90=-9r

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Solution for 90=-9r equation:


90=-9r

We simplify the equation to the form, which is simple to understand 
90=-9r

We move all terms containing r to the left and all other terms to the right. 
+9r=-90

We simplify left and right side of the equation. 
+9r=-90

We divide both sides of the equation by 09 to get r. 
r=-10

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