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Simplifying (10 + -1R) + (20 + -1D) + (20 + -1R) = 0 Remove parenthesis around (10 + -1R) 10 + -1R + (20 + -1D) + (20 + -1R) = 0 Remove parenthesis around (20 + -1D) 10 + -1R + 20 + -1D + (20 + -1R) = 0 Remove parenthesis around (20 + -1R) 10 + -1R + 20 + -1D + 20 + -1R = 0 Reorder the terms: 10 + 20 + 20 + -1D + -1R + -1R = 0 Combine like terms: 10 + 20 = 30 30 + 20 + -1D + -1R + -1R = 0 Combine like terms: 30 + 20 = 50 50 + -1D + -1R + -1R = 0 Combine like terms: -1R + -1R = -2R 50 + -1D + -2R = 0 Solving 50 + -1D + -2R = 0 Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '-50' to each side of the equation. 50 + -1D + -50 + -2R = 0 + -50 Reorder the terms: 50 + -50 + -1D + -2R = 0 + -50 Combine like terms: 50 + -50 = 0 0 + -1D + -2R = 0 + -50 -1D + -2R = 0 + -50 Combine like terms: 0 + -50 = -50 -1D + -2R = -50 Add '2R' to each side of the equation. -1D + -2R + 2R = -50 + 2R Combine like terms: -2R + 2R = 0 -1D + 0 = -50 + 2R -1D = -50 + 2R Divide each side by '-1'. D = 50 + -2R Simplifying D = 50 + -2R
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