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Simplifying 5(r + -1) = 20 Reorder the terms: 5(-1 + r) = 20 (-1 * 5 + r * 5) = 20 (-5 + 5r) = 20 Solving -5 + 5r = 20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + 5r = 20 + 5 Combine like terms: -5 + 5 = 0 0 + 5r = 20 + 5 5r = 20 + 5 Combine like terms: 20 + 5 = 25 5r = 25 Divide each side by '5'. r = 5 Simplifying r = 5
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