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6r-15r=99
We simplify the equation to the form, which is simple to understand
6r-15r=99
We move all terms containing r to the left and all other terms to the right.
+6r-15r=+99
We simplify left and right side of the equation.
-9r=+99
We divide both sides of the equation by -9 to get r.
r=-11
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