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