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Simplifying -3d + -21 = -3(d + 7) + -10d Reorder the terms: -21 + -3d = -3(d + 7) + -10d Reorder the terms: -21 + -3d = -3(7 + d) + -10d -21 + -3d = (7 * -3 + d * -3) + -10d -21 + -3d = (-21 + -3d) + -10d Combine like terms: -3d + -10d = -13d -21 + -3d = -21 + -13d Add '21' to each side of the equation. -21 + 21 + -3d = -21 + 21 + -13d Combine like terms: -21 + 21 = 0 0 + -3d = -21 + 21 + -13d -3d = -21 + 21 + -13d Combine like terms: -21 + 21 = 0 -3d = 0 + -13d -3d = -13d Solving -3d = -13d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '13d' to each side of the equation. -3d + 13d = -13d + 13d Combine like terms: -3d + 13d = 10d 10d = -13d + 13d Combine like terms: -13d + 13d = 0 10d = 0 Divide each side by '10'. d = 0.0 Simplifying d = 0.0
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