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Simplifying 2(d + 7) + -1 = 2d + 13 Reorder the terms: 2(7 + d) + -1 = 2d + 13 (7 * 2 + d * 2) + -1 = 2d + 13 (14 + 2d) + -1 = 2d + 13 Reorder the terms: 14 + -1 + 2d = 2d + 13 Combine like terms: 14 + -1 = 13 13 + 2d = 2d + 13 Reorder the terms: 13 + 2d = 13 + 2d Add '-13' to each side of the equation. 13 + -13 + 2d = 13 + -13 + 2d Combine like terms: 13 + -13 = 0 0 + 2d = 13 + -13 + 2d 2d = 13 + -13 + 2d Combine like terms: 13 + -13 = 0 2d = 0 + 2d 2d = 2d Add '-2d' to each side of the equation. 2d + -2d = 2d + -2d Combine like terms: 2d + -2d = 0 0 = 2d + -2d Combine like terms: 2d + -2d = 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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