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2+9r+16=0
We simplify the equation to the form, which is simple to understand
2+9r+16=0
We move all terms containing r to the left and all other terms to the right.
+9r=0-2-16
We simplify left and right side of the equation.
+9r=-18
We divide both sides of the equation by 9 to get r.
r=-2
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