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-18=4r-9r
We simplify the equation to the form, which is simple to understand
-18=4r-9r
We move all terms containing r to the left and all other terms to the right.
-4r+9r=+18
We simplify left and right side of the equation.
+5r=+18
We divide both sides of the equation by 5 to get r.
r=3.6
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