12=-3r

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Solution for 12=-3r equation:


12=-3r

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

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

We simplify left and right side of the equation. 
+3r=-12

We divide both sides of the equation by 03 to get r. 
r=-4

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