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15(1-r)=-8r-9
We simplify the equation to the form, which is simple to understand
15(1-r)=-8r-9
Reorder the terms in parentheses
+(+15-15r)=-8r-9
Remove unnecessary parentheses
+15-15r=-8r-9
We move all terms containing r to the left and all other terms to the right.
-15r+8r=-9-15
We simplify left and right side of the equation.
-7r=-24
We divide both sides of the equation by -7 to get r.
r=3.42857142857
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