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18+3/7r=-18
We simplify the equation to the form, which is simple to understand
18+3/7r=-18
We move all terms containing r to the left and all other terms to the right.
+7r=-18-18
We simplify left and right side of the equation.
+7r=-36
We divide both sides of the equation by 7 to get r.
r=-5.1428571428571
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