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Simplifying D = d + -1 + -1(3d + 4) + (5 + -4d) + -1(7d + 5) + 5 Reorder the terms: D = d + -1 + -1(4 + 3d) + (5 + -4d) + -1(7d + 5) + 5 D = d + -1 + (4 * -1 + 3d * -1) + (5 + -4d) + -1(7d + 5) + 5 D = d + -1 + (-4 + -3d) + (5 + -4d) + -1(7d + 5) + 5 Remove parenthesis around (5 + -4d) D = d + -1 + -4 + -3d + 5 + -4d + -1(7d + 5) + 5 Reorder the terms: D = d + -1 + -4 + -3d + 5 + -4d + -1(5 + 7d) + 5 D = d + -1 + -4 + -3d + 5 + -4d + (5 * -1 + 7d * -1) + 5 D = d + -1 + -4 + -3d + 5 + -4d + (-5 + -7d) + 5 Reorder the terms: D = -1 + -4 + 5 + -5 + 5 + d + -3d + -4d + -7d Combine like terms: -1 + -4 = -5 D = -5 + 5 + -5 + 5 + d + -3d + -4d + -7d Combine like terms: -5 + 5 = 0 D = 0 + -5 + 5 + d + -3d + -4d + -7d D = -5 + 5 + d + -3d + -4d + -7d Combine like terms: -5 + 5 = 0 D = 0 + d + -3d + -4d + -7d D = d + -3d + -4d + -7d Combine like terms: d + -3d = -2d D = -2d + -4d + -7d Combine like terms: -2d + -4d = -6d D = -6d + -7d Combine like terms: -6d + -7d = -13d D = -13d Solving D = -13d Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Simplifying D = -13d
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