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Simplifying 3(-7 + 2d) + -8d = 7 (-7 * 3 + 2d * 3) + -8d = 7 (-21 + 6d) + -8d = 7 Combine like terms: 6d + -8d = -2d -21 + -2d = 7 Solving -21 + -2d = 7 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + -2d = 7 + 21 Combine like terms: -21 + 21 = 0 0 + -2d = 7 + 21 -2d = 7 + 21 Combine like terms: 7 + 21 = 28 -2d = 28 Divide each side by '-2'. d = -14 Simplifying d = -14
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