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