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Simplifying 3d + -9 + -1(d + 4) = 0 Reorder the terms: 3d + -9 + -1(4 + d) = 0 3d + -9 + (4 * -1 + d * -1) = 0 3d + -9 + (-4 + -1d) = 0 Reorder the terms: -9 + -4 + 3d + -1d = 0 Combine like terms: -9 + -4 = -13 -13 + 3d + -1d = 0 Combine like terms: 3d + -1d = 2d -13 + 2d = 0 Solving -13 + 2d = 0 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '13' to each side of the equation. -13 + 13 + 2d = 0 + 13 Combine like terms: -13 + 13 = 0 0 + 2d = 0 + 13 2d = 0 + 13 Combine like terms: 0 + 13 = 13 2d = 13 Divide each side by '2'. d = 6.5 Simplifying d = 6.5
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