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Simplifying -7(d + -12) = -21 Reorder the terms: -7(-12 + d) = -21 (-12 * -7 + d * -7) = -21 (84 + -7d) = -21 Solving 84 + -7d = -21 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + -7d = -21 + -84 Combine like terms: 84 + -84 = 0 0 + -7d = -21 + -84 -7d = -21 + -84 Combine like terms: -21 + -84 = -105 -7d = -105 Divide each side by '-7'. d = 15 Simplifying d = 15
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