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Simplifying r + 4 + -5r = -16 Reorder the terms: 4 + r + -5r = -16 Combine like terms: r + -5r = -4r 4 + -4r = -16 Solving 4 + -4r = -16 Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + -4r = -16 + -4 Combine like terms: 4 + -4 = 0 0 + -4r = -16 + -4 -4r = -16 + -4 Combine like terms: -16 + -4 = -20 -4r = -20 Divide each side by '-4'. r = 5 Simplifying r = 5
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