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Simplifying 3a + 20 = 9a + -6a + 20 Reorder the terms: 20 + 3a = 9a + -6a + 20 Reorder the terms: 20 + 3a = 20 + 9a + -6a Combine like terms: 9a + -6a = 3a 20 + 3a = 20 + 3a Add '-20' to each side of the equation. 20 + -20 + 3a = 20 + -20 + 3a Combine like terms: 20 + -20 = 0 0 + 3a = 20 + -20 + 3a 3a = 20 + -20 + 3a Combine like terms: 20 + -20 = 0 3a = 0 + 3a 3a = 3a Add '-3a' to each side of the equation. 3a + -3a = 3a + -3a Combine like terms: 3a + -3a = 0 0 = 3a + -3a Combine like terms: 3a + -3a = 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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