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Simplifying 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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