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Simplifying -15 + (13 + 15) = (-15 + 13) + 15 Combine like terms: 13 + 15 = 28 -15 + (28) = (-15 + 13) + 15 -15 + 28 = (-15 + 13) + 15 Combine like terms: -15 + 28 = 13 13 = (-15 + 13) + 15 Combine like terms: -15 + 13 = -2 13 = (-2) + 15 13 = -2 + 15 Combine like terms: -2 + 15 = 13 13 = 13 Add '-13' to each side of the equation. 13 + -13 = 13 + -13 Combine like terms: 13 + -13 = 0 0 = 13 + -13 Combine like terms: 13 + -13 = 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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