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Simplifying 7(a + 3) = 3a + 21 + 4a Reorder the terms: 7(3 + a) = 3a + 21 + 4a (3 * 7 + a * 7) = 3a + 21 + 4a (21 + 7a) = 3a + 21 + 4a Reorder the terms: 21 + 7a = 21 + 3a + 4a Combine like terms: 3a + 4a = 7a 21 + 7a = 21 + 7a Add '-21' to each side of the equation. 21 + -21 + 7a = 21 + -21 + 7a Combine like terms: 21 + -21 = 0 0 + 7a = 21 + -21 + 7a 7a = 21 + -21 + 7a Combine like terms: 21 + -21 = 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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