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Simplifying 4 = 2(d + -1) Reorder the terms: 4 = 2(-1 + d) 4 = (-1 * 2 + d * 2) 4 = (-2 + 2d) Solving 4 = -2 + 2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2d' to each side of the equation. 4 + -2d = -2 + 2d + -2d Combine like terms: 2d + -2d = 0 4 + -2d = -2 + 0 4 + -2d = -2 Add '-4' to each side of the equation. 4 + -4 + -2d = -2 + -4 Combine like terms: 4 + -4 = 0 0 + -2d = -2 + -4 -2d = -2 + -4 Combine like terms: -2 + -4 = -6 -2d = -6 Divide each side by '-2'. d = 3 Simplifying d = 3
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