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Simplifying -21 = 3(6d + -4) Reorder the terms: -21 = 3(-4 + 6d) -21 = (-4 * 3 + 6d * 3) -21 = (-12 + 18d) Solving -21 = -12 + 18d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-18d' to each side of the equation. -21 + -18d = -12 + 18d + -18d Combine like terms: 18d + -18d = 0 -21 + -18d = -12 + 0 -21 + -18d = -12 Add '21' to each side of the equation. -21 + 21 + -18d = -12 + 21 Combine like terms: -21 + 21 = 0 0 + -18d = -12 + 21 -18d = -12 + 21 Combine like terms: -12 + 21 = 9 -18d = 9 Divide each side by '-18'. d = -0.5 Simplifying d = -0.5
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