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Simplifying -14 + 3d + 21 = 2d + 7 + d Reorder the terms: -14 + 21 + 3d = 2d + 7 + d Combine like terms: -14 + 21 = 7 7 + 3d = 2d + 7 + d Reorder the terms: 7 + 3d = 7 + 2d + d Combine like terms: 2d + d = 3d 7 + 3d = 7 + 3d Add '-7' to each side of the equation. 7 + -7 + 3d = 7 + -7 + 3d Combine like terms: 7 + -7 = 0 0 + 3d = 7 + -7 + 3d 3d = 7 + -7 + 3d Combine like terms: 7 + -7 = 0 3d = 0 + 3d 3d = 3d Add '-3d' to each side of the equation. 3d + -3d = 3d + -3d Combine like terms: 3d + -3d = 0 0 = 3d + -3d Combine like terms: 3d + -3d = 0 0 = 0 Solving 0 = 0 Couldn't find a variable to solve for. This equation is an identity, all real numbers are solutions.
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