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Simplifying 40 + 7.50d = 12.50d Solving 40 + 7.50d = 12.50d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-12.50d' to each side of the equation. 40 + 7.50d + -12.50d = 12.50d + -12.50d Combine like terms: 7.50d + -12.50d = -5d 40 + -5d = 12.50d + -12.50d Combine like terms: 12.50d + -12.50d = 0.00 40 + -5d = 0.00 Add '-40' to each side of the equation. 40 + -40 + -5d = 0.00 + -40 Combine like terms: 40 + -40 = 0 0 + -5d = 0.00 + -40 -5d = 0.00 + -40 Combine like terms: 0.00 + -40 = -40 -5d = -40 Divide each side by '-5'. d = 8 Simplifying d = 8
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