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Simplifying 28 + 8a = -4 + -4(-8 + -2a) 28 + 8a = -4 + (-8 * -4 + -2a * -4) 28 + 8a = -4 + (32 + 8a) Combine like terms: -4 + 32 = 28 28 + 8a = 28 + 8a Add '-28' to each side of the equation. 28 + -28 + 8a = 28 + -28 + 8a Combine like terms: 28 + -28 = 0 0 + 8a = 28 + -28 + 8a 8a = 28 + -28 + 8a Combine like terms: 28 + -28 = 0 8a = 0 + 8a 8a = 8a Add '-8a' to each side of the equation. 8a + -8a = 8a + -8a Combine like terms: 8a + -8a = 0 0 = 8a + -8a Combine like terms: 8a + -8a = 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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