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15r+9=63
We simplify the equation to the form, which is simple to understand
15r+9=63
We move all terms containing r to the left and all other terms to the right.
+15r=+63-9
We simplify left and right side of the equation.
+15r=+54
We divide both sides of the equation by 15 to get r.
r=3.6
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