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8r+3+3=31
We simplify the equation to the form, which is simple to understand
8r+3+3=31
We move all terms containing r to the left and all other terms to the right.
+8r=+31-3-3
We simplify left and right side of the equation.
+8r=+25
We divide both sides of the equation by 8 to get r.
r=3.125
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