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Simplifying -5r + -4(-5r + -5) = -85 Reorder the terms: -5r + -4(-5 + -5r) = -85 -5r + (-5 * -4 + -5r * -4) = -85 -5r + (20 + 20r) = -85 Reorder the terms: 20 + -5r + 20r = -85 Combine like terms: -5r + 20r = 15r 20 + 15r = -85 Solving 20 + 15r = -85 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 15r = -85 + -20 Combine like terms: 20 + -20 = 0 0 + 15r = -85 + -20 15r = -85 + -20 Combine like terms: -85 + -20 = -105 15r = -105 Divide each side by '15'. r = -7 Simplifying r = -7
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