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Simplifying 21 = 5(d + -7) + -4 Reorder the terms: 21 = 5(-7 + d) + -4 21 = (-7 * 5 + d * 5) + -4 21 = (-35 + 5d) + -4 Reorder the terms: 21 = -35 + -4 + 5d Combine like terms: -35 + -4 = -39 21 = -39 + 5d Solving 21 = -39 + 5d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-5d' to each side of the equation. 21 + -5d = -39 + 5d + -5d Combine like terms: 5d + -5d = 0 21 + -5d = -39 + 0 21 + -5d = -39 Add '-21' to each side of the equation. 21 + -21 + -5d = -39 + -21 Combine like terms: 21 + -21 = 0 0 + -5d = -39 + -21 -5d = -39 + -21 Combine like terms: -39 + -21 = -60 -5d = -60 Divide each side by '-5'. d = 12 Simplifying d = 12
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