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Simplifying 300 + -2.5d = 7.5d + 100 Reorder the terms: 300 + -2.5d = 100 + 7.5d Solving 300 + -2.5d = 100 + 7.5d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-7.5d' to each side of the equation. 300 + -2.5d + -7.5d = 100 + 7.5d + -7.5d Combine like terms: -2.5d + -7.5d = -10d 300 + -10d = 100 + 7.5d + -7.5d Combine like terms: 7.5d + -7.5d = 0.0 300 + -10d = 100 + 0.0 300 + -10d = 100 Add '-300' to each side of the equation. 300 + -300 + -10d = 100 + -300 Combine like terms: 300 + -300 = 0 0 + -10d = 100 + -300 -10d = 100 + -300 Combine like terms: 100 + -300 = -200 -10d = -200 Divide each side by '-10'. d = 20 Simplifying d = 20
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