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Simplifying 13 = -1d + 20 Reorder the terms: 13 = 20 + -1d Solving 13 = 20 + -1d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add 'd' to each side of the equation. 13 + d = 20 + -1d + d Combine like terms: -1d + d = 0 13 + d = 20 + 0 13 + d = 20 Add '-13' to each side of the equation. 13 + -13 + d = 20 + -13 Combine like terms: 13 + -13 = 0 0 + d = 20 + -13 d = 20 + -13 Combine like terms: 20 + -13 = 7 d = 7 Simplifying d = 7
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