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Simplifying 9 + 2n = 15 + -1(6 + -2n) 9 + 2n = 15 + (6 * -1 + -2n * -1) 9 + 2n = 15 + (-6 + 2n) Combine like terms: 15 + -6 = 9 9 + 2n = 9 + 2n Add '-9' to each side of the equation. 9 + -9 + 2n = 9 + -9 + 2n Combine like terms: 9 + -9 = 0 0 + 2n = 9 + -9 + 2n 2n = 9 + -9 + 2n Combine like terms: 9 + -9 = 0 2n = 0 + 2n 2n = 2n Add '-2n' to each side of the equation. 2n + -2n = 2n + -2n Combine like terms: 2n + -2n = 0 0 = 2n + -2n Combine like terms: 2n + -2n = 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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