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Simplifying 7 = 2d + -1 Reorder the terms: 7 = -1 + 2d Solving 7 = -1 + 2d Solving for variable 'd'. Move all terms containing d to the left, all other terms to the right. Add '-2d' to each side of the equation. 7 + -2d = -1 + 2d + -2d Combine like terms: 2d + -2d = 0 7 + -2d = -1 + 0 7 + -2d = -1 Add '-7' to each side of the equation. 7 + -7 + -2d = -1 + -7 Combine like terms: 7 + -7 = 0 0 + -2d = -1 + -7 -2d = -1 + -7 Combine like terms: -1 + -7 = -8 -2d = -8 Divide each side by '-2'. d = 4 Simplifying d = 4
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