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Simplifying -18D + -21 = 15D + 3 Reorder the terms: -21 + -18D = 15D + 3 Reorder the terms: -21 + -18D = 3 + 15D Solving -21 + -18D = 3 + 15D Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '-15D' to each side of the equation. -21 + -18D + -15D = 3 + 15D + -15D Combine like terms: -18D + -15D = -33D -21 + -33D = 3 + 15D + -15D Combine like terms: 15D + -15D = 0 -21 + -33D = 3 + 0 -21 + -33D = 3 Add '21' to each side of the equation. -21 + 21 + -33D = 3 + 21 Combine like terms: -21 + 21 = 0 0 + -33D = 3 + 21 -33D = 3 + 21 Combine like terms: 3 + 21 = 24 -33D = 24 Divide each side by '-33'. D = -0.7272727273 Simplifying D = -0.7272727273
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