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Simplifying 215 + d = 165 + 2d Solving 215 + d = 165 + 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. 215 + d + -2d = 165 + 2d + -2d Combine like terms: d + -2d = -1d 215 + -1d = 165 + 2d + -2d Combine like terms: 2d + -2d = 0 215 + -1d = 165 + 0 215 + -1d = 165 Add '-215' to each side of the equation. 215 + -215 + -1d = 165 + -215 Combine like terms: 215 + -215 = 0 0 + -1d = 165 + -215 -1d = 165 + -215 Combine like terms: 165 + -215 = -50 -1d = -50 Divide each side by '-1'. d = 50 Simplifying d = 50
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