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Simplifying 2a + 20 = 3a + -9 Reorder the terms: 20 + 2a = 3a + -9 Reorder the terms: 20 + 2a = -9 + 3a Solving 20 + 2a = -9 + 3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-3a' to each side of the equation. 20 + 2a + -3a = -9 + 3a + -3a Combine like terms: 2a + -3a = -1a 20 + -1a = -9 + 3a + -3a Combine like terms: 3a + -3a = 0 20 + -1a = -9 + 0 20 + -1a = -9 Add '-20' to each side of the equation. 20 + -20 + -1a = -9 + -20 Combine like terms: 20 + -20 = 0 0 + -1a = -9 + -20 -1a = -9 + -20 Combine like terms: -9 + -20 = -29 -1a = -29 Divide each side by '-1'. a = 29 Simplifying a = 29
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