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Simplifying 9a + -4(2a + 5) = a + -20 Reorder the terms: 9a + -4(5 + 2a) = a + -20 9a + (5 * -4 + 2a * -4) = a + -20 9a + (-20 + -8a) = a + -20 Reorder the terms: -20 + 9a + -8a = a + -20 Combine like terms: 9a + -8a = 1a -20 + 1a = a + -20 Reorder the terms: -20 + 1a = -20 + a Add '20' to each side of the equation. -20 + 20 + 1a = -20 + 20 + a Combine like terms: -20 + 20 = 0 0 + 1a = -20 + 20 + a 1a = -20 + 20 + a Combine like terms: -20 + 20 = 0 1a = 0 + a 1a = a Solving 1a = a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 1a + -1a = a + -1a Combine like terms: 1a + -1a = 0 0 = a + -1a Combine like terms: a + -1a = 0 0 = 0 Simplifying 0 = 0 The solution to this equation could not be determined.
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