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Simplifying 13 + 5r = -20 Solving 13 + 5r = -20 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 5r = -20 + -13 Combine like terms: 13 + -13 = 0 0 + 5r = -20 + -13 5r = -20 + -13 Combine like terms: -20 + -13 = -33 5r = -33 Divide each side by '5'. r = -6.6 Simplifying r = -6.6
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