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Simplifying 27 + -9a = 9(3 + -1a) 27 + -9a = (3 * 9 + -1a * 9) 27 + -9a = (27 + -9a) Add '-27' to each side of the equation. 27 + -27 + -9a = 27 + -27 + -9a Combine like terms: 27 + -27 = 0 0 + -9a = 27 + -27 + -9a -9a = 27 + -27 + -9a Combine like terms: 27 + -27 = 0 -9a = 0 + -9a -9a = -9a Add '9a' to each side of the equation. -9a + 9a = -9a + 9a Combine like terms: -9a + 9a = 0 0 = -9a + 9a Combine like terms: -9a + 9a = 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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