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Simplifying 0.125D + -3(D + -7) = 5.125D + -3 Reorder the terms: 0.125D + -3(-7 + D) = 5.125D + -3 0.125D + (-7 * -3 + D * -3) = 5.125D + -3 0.125D + (21 + -3D) = 5.125D + -3 Reorder the terms: 21 + 0.125D + -3D = 5.125D + -3 Combine like terms: 0.125D + -3D = -2.875D 21 + -2.875D = 5.125D + -3 Reorder the terms: 21 + -2.875D = -3 + 5.125D Solving 21 + -2.875D = -3 + 5.125D Solving for variable 'D'. Move all terms containing D to the left, all other terms to the right. Add '-5.125D' to each side of the equation. 21 + -2.875D + -5.125D = -3 + 5.125D + -5.125D Combine like terms: -2.875D + -5.125D = -8D 21 + -8D = -3 + 5.125D + -5.125D Combine like terms: 5.125D + -5.125D = 0.000 21 + -8D = -3 + 0.000 21 + -8D = -3 Add '-21' to each side of the equation. 21 + -21 + -8D = -3 + -21 Combine like terms: 21 + -21 = 0 0 + -8D = -3 + -21 -8D = -3 + -21 Combine like terms: -3 + -21 = -24 -8D = -24 Divide each side by '-8'. D = 3 Simplifying D = 3
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