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Simplifying 3d + -7 = d + -21 Reorder the terms: -7 + 3d = d + -21 Reorder the terms: -7 + 3d = -21 + d Solving -7 + 3d = -21 + d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1d' to each side of the equation. -7 + 3d + -1d = -21 + d + -1d Combine like terms: 3d + -1d = 2d -7 + 2d = -21 + d + -1d Combine like terms: d + -1d = 0 -7 + 2d = -21 + 0 -7 + 2d = -21 Add '7' to each side of the equation. -7 + 7 + 2d = -21 + 7 Combine like terms: -7 + 7 = 0 0 + 2d = -21 + 7 2d = -21 + 7 Combine like terms: -21 + 7 = -14 2d = -14 Divide each side by '2'. d = -7 Simplifying d = -7
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