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Simplifying -80 = -5(1 + -5r) -80 = (1 * -5 + -5r * -5) -80 = (-5 + 25r) Solving -80 = -5 + 25r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-25r' to each side of the equation. -80 + -25r = -5 + 25r + -25r Combine like terms: 25r + -25r = 0 -80 + -25r = -5 + 0 -80 + -25r = -5 Add '80' to each side of the equation. -80 + 80 + -25r = -5 + 80 Combine like terms: -80 + 80 = 0 0 + -25r = -5 + 80 -25r = -5 + 80 Combine like terms: -5 + 80 = 75 -25r = 75 Divide each side by '-25'. r = -3 Simplifying r = -3
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