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Simplifying 21 + -1 * 2 + 5 + -9 = 15 Multiply -1 * 2 21 + -2 + 5 + -9 = 15 Combine like terms: 21 + -2 = 19 19 + 5 + -9 = 15 Combine like terms: 19 + 5 = 24 24 + -9 = 15 Combine like terms: 24 + -9 = 15 15 = 15 Add '-15' to each side of the equation. 15 + -15 = 15 + -15 Combine like terms: 15 + -15 = 0 0 = 15 + -15 Combine like terms: 15 + -15 = 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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