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Simplifying 12 + 2a + 5a = 3 + 7a + 9 Combine like terms: 2a + 5a = 7a 12 + 7a = 3 + 7a + 9 Reorder the terms: 12 + 7a = 3 + 9 + 7a Combine like terms: 3 + 9 = 12 12 + 7a = 12 + 7a Add '-12' to each side of the equation. 12 + -12 + 7a = 12 + -12 + 7a Combine like terms: 12 + -12 = 0 0 + 7a = 12 + -12 + 7a 7a = 12 + -12 + 7a Combine like terms: 12 + -12 = 0 7a = 0 + 7a 7a = 7a Add '-7a' to each side of the equation. 7a + -7a = 7a + -7a Combine like terms: 7a + -7a = 0 0 = 7a + -7a Combine like terms: 7a + -7a = 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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