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Simplifying 12d + -9 + -5d = 12d + -9 + -5d Reorder the terms: -9 + 12d + -5d = 12d + -9 + -5d Combine like terms: 12d + -5d = 7d -9 + 7d = 12d + -9 + -5d Reorder the terms: -9 + 7d = -9 + 12d + -5d Combine like terms: 12d + -5d = 7d -9 + 7d = -9 + 7d Add '9' to each side of the equation. -9 + 9 + 7d = -9 + 9 + 7d Combine like terms: -9 + 9 = 0 0 + 7d = -9 + 9 + 7d 7d = -9 + 9 + 7d Combine like terms: -9 + 9 = 0 7d = 0 + 7d 7d = 7d Add '-7d' to each side of the equation. 7d + -7d = 7d + -7d Combine like terms: 7d + -7d = 0 0 = 7d + -7d Combine like terms: 7d + -7d = 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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