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Simplifying 21 + 7d + 3d + -15 = 13d + 15 + -3d + -9 Reorder the terms: 21 + -15 + 7d + 3d = 13d + 15 + -3d + -9 Combine like terms: 21 + -15 = 6 6 + 7d + 3d = 13d + 15 + -3d + -9 Combine like terms: 7d + 3d = 10d 6 + 10d = 13d + 15 + -3d + -9 Reorder the terms: 6 + 10d = 15 + -9 + 13d + -3d Combine like terms: 15 + -9 = 6 6 + 10d = 6 + 13d + -3d Combine like terms: 13d + -3d = 10d 6 + 10d = 6 + 10d Add '-6' to each side of the equation. 6 + -6 + 10d = 6 + -6 + 10d Combine like terms: 6 + -6 = 0 0 + 10d = 6 + -6 + 10d 10d = 6 + -6 + 10d Combine like terms: 6 + -6 = 0 10d = 0 + 10d 10d = 10d Add '-10d' to each side of the equation. 10d + -10d = 10d + -10d Combine like terms: 10d + -10d = 0 0 = 10d + -10d Combine like terms: 10d + -10d = 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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