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Simplifying 30 + -1d = 2d Solving 30 + -1d = 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. 30 + -1d + -2d = 2d + -2d Combine like terms: -1d + -2d = -3d 30 + -3d = 2d + -2d Combine like terms: 2d + -2d = 0 30 + -3d = 0 Add '-30' to each side of the equation. 30 + -30 + -3d = 0 + -30 Combine like terms: 30 + -30 = 0 0 + -3d = 0 + -30 -3d = 0 + -30 Combine like terms: 0 + -30 = -30 -3d = -30 Divide each side by '-3'. d = 10 Simplifying d = 10
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