12-3r=-9

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Solution for 12-3r=-9 equation:


12-3r=-9

We simplify the equation to the form, which is simple to understand 
12-3r=-9

We move all terms containing r to the left and all other terms to the right. 
-3r=-9-12

We simplify left and right side of the equation. 
-3r=-21

We divide both sides of the equation by -3 to get r. 
r=7

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