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r+9r-5+2r=-9
We simplify the equation to the form, which is simple to understand
r+9r-5+2r=-9
We move all terms containing r to the left and all other terms to the right.
+1r+9r+2r=-9+5
We simplify left and right side of the equation.
+12r=-4
We divide both sides of the equation by 12 to get r.
r=-0.333333333333
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