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Simplifying -9(a + 3) = -9a + -20 + -7 Reorder the terms: -9(3 + a) = -9a + -20 + -7 (3 * -9 + a * -9) = -9a + -20 + -7 (-27 + -9a) = -9a + -20 + -7 Reorder the terms: -27 + -9a = -20 + -7 + -9a Combine like terms: -20 + -7 = -27 -27 + -9a = -27 + -9a Add '27' to each side of the equation. -27 + 27 + -9a = -27 + 27 + -9a Combine like terms: -27 + 27 = 0 0 + -9a = -27 + 27 + -9a -9a = -27 + 27 + -9a Combine like terms: -27 + 27 = 0 -9a = 0 + -9a -9a = -9a Add '9a' to each side of the equation. -9a + 9a = -9a + 9a Combine like terms: -9a + 9a = 0 0 = -9a + 9a Combine like terms: -9a + 9a = 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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