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Simplifying -1a + 7(1 + 3a) + -20 = 20a + -13 -1a + (1 * 7 + 3a * 7) + -20 = 20a + -13 -1a + (7 + 21a) + -20 = 20a + -13 Reorder the terms: 7 + -20 + -1a + 21a = 20a + -13 Combine like terms: 7 + -20 = -13 -13 + -1a + 21a = 20a + -13 Combine like terms: -1a + 21a = 20a -13 + 20a = 20a + -13 Reorder the terms: -13 + 20a = -13 + 20a Add '13' to each side of the equation. -13 + 13 + 20a = -13 + 13 + 20a Combine like terms: -13 + 13 = 0 0 + 20a = -13 + 13 + 20a 20a = -13 + 13 + 20a Combine like terms: -13 + 13 = 0 20a = 0 + 20a 20a = 20a Add '-20a' to each side of the equation. 20a + -20a = 20a + -20a Combine like terms: 20a + -20a = 0 0 = 20a + -20a Combine like terms: 20a + -20a = 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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