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-198=5r+6r
We simplify the equation to the form, which is simple to understand
-198=5r+6r
We move all terms containing r to the left and all other terms to the right.
-5r-6r=+198
We simplify left and right side of the equation.
-11r=+198
We divide both sides of the equation by -11 to get r.
r=-18
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