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Simplifying 2d + -19d + -1(-12d) + -12d + (-3d) = 20 Remove parenthesis around (-12d) 2d + -19d + -1 * -12d + -12d + (-3d) = 20 Multiply -1 * -12 2d + -19d + 12d + -12d + (-3d) = 20 Combine like terms: 2d + -19d = -17d -17d + 12d + -12d + (-3d) = 20 Combine like terms: -17d + 12d = -5d -5d + -12d + (-3d) = 20 Combine like terms: -5d + -12d = -17d -17d + (-3d) = 20 Combine like terms: -17d + (-3d) = -20d -20d = 20 Solving -20d = 20 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Divide each side by '-20'. d = -1 Simplifying d = -1
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