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-15r-18r=11
We simplify the equation to the form, which is simple to understand
-15r-18r=11
We move all terms containing r to the left and all other terms to the right.
-15r-18r=+11
We simplify left and right side of the equation.
-33r=+11
We divide both sides of the equation by -33 to get r.
r=-0.33333333333333
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