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Simplifying 8 + -7(1 + 3d) = -19 8 + (1 * -7 + 3d * -7) = -19 8 + (-7 + -21d) = -19 Combine like terms: 8 + -7 = 1 1 + -21d = -19 Solving 1 + -21d = -19 Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -21d = -19 + -1 Combine like terms: 1 + -1 = 0 0 + -21d = -19 + -1 -21d = -19 + -1 Combine like terms: -19 + -1 = -20 -21d = -20 Divide each side by '-21'. d = 0.9523809524 Simplifying d = 0.9523809524
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