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Simplifying 16 + 8r + -4r + 4 = r Reorder the terms: 16 + 4 + 8r + -4r = r Combine like terms: 16 + 4 = 20 20 + 8r + -4r = r Combine like terms: 8r + -4r = 4r 20 + 4r = r Solving 20 + 4r = r Solving for variable 'r'. Move all terms containing r to the left, all other terms to the right. Add '-1r' to each side of the equation. 20 + 4r + -1r = r + -1r Combine like terms: 4r + -1r = 3r 20 + 3r = r + -1r Combine like terms: r + -1r = 0 20 + 3r = 0 Add '-20' to each side of the equation. 20 + -20 + 3r = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 3r = 0 + -20 3r = 0 + -20 Combine like terms: 0 + -20 = -20 3r = -20 Divide each side by '3'. r = -6.666666667 Simplifying r = -6.666666667
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