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Simplifying 16 + 8r + -4r + 4 = 2 Reorder the terms: 16 + 4 + 8r + -4r = 2 Combine like terms: 16 + 4 = 20 20 + 8r + -4r = 2 Combine like terms: 8r + -4r = 4r 20 + 4r = 2 Solving 20 + 4r = 2 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 + 4r = 2 + -20 Combine like terms: 20 + -20 = 0 0 + 4r = 2 + -20 4r = 2 + -20 Combine like terms: 2 + -20 = -18 4r = -18 Divide each side by '4'. r = -4.5 Simplifying r = -4.5
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