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-7r-16=-3r-8r
We simplify the equation to the form, which is simple to understand
-7r-16=-3r-8r
We move all terms containing r to the left and all other terms to the right.
-7r+3r+8r=+16
We simplify left and right side of the equation.
+4r=+16
We divide both sides of the equation by 4 to get r.
r=4
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