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Simplifying 7 + (0.20d) = 5 + (0.30d) Solving 7 + (0.20d) = 5 + (0.30d) Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '(-0.30d)' to each side of the equation. 7 + (0.20d) + (-0.30d) = 5 + (0.30d) + (-0.30d) Combine like terms: (0.20d) + (-0.30d) = -0.1d 7 + -0.1d = 5 + (0.30d) + (-0.30d) Combine like terms: (0.30d) + (-0.30d) = 0.00 7 + -0.1d = 5 + 0.00 7 + -0.1d = 5 Add '-7' to each side of the equation. 7 + -7 + -0.1d = 5 + -7 Combine like terms: 7 + -7 = 0 0 + -0.1d = 5 + -7 -0.1d = 5 + -7 Combine like terms: 5 + -7 = -2 -0.1d = -2 Divide each side by '-0.1'. d = 20 Simplifying d = 20
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