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3(7r-1)-8=-16
We simplify the equation to the form, which is simple to understand
3(7r-1)-8=-16
Reorder the terms in parentheses
+(+21r-3)-8=-16
Remove unnecessary parentheses
+21r-3-8=-16
We move all terms containing r to the left and all other terms to the right.
+21r=-16+3+8
We simplify left and right side of the equation.
+21r=-5
We divide both sides of the equation by 21 to get r.
r=-0.23809523809524
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