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Simplifying 7 = -13 + -1d Solving 7 = -13 + -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. 7 + d = -13 + -1d + d Combine like terms: -1d + d = 0 7 + d = -13 + 0 7 + d = -13 Add '-7' to each side of the equation. 7 + -7 + d = -13 + -7 Combine like terms: 7 + -7 = 0 0 + d = -13 + -7 d = -13 + -7 Combine like terms: -13 + -7 = -20 d = -20 Simplifying d = -20
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