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Simplifying 12 + 10 + 5 = a * 2 + -9 Combine like terms: 12 + 10 = 22 22 + 5 = a * 2 + -9 Combine like terms: 22 + 5 = 27 27 = a * 2 + -9 Reorder the terms for easier multiplication: 27 = 2a + -9 Reorder the terms: 27 = -9 + 2a Solving 27 = -9 + 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 27 + -2a = -9 + 2a + -2a Combine like terms: 2a + -2a = 0 27 + -2a = -9 + 0 27 + -2a = -9 Add '-27' to each side of the equation. 27 + -27 + -2a = -9 + -27 Combine like terms: 27 + -27 = 0 0 + -2a = -9 + -27 -2a = -9 + -27 Combine like terms: -9 + -27 = -36 -2a = -36 Divide each side by '-2'. a = 18 Simplifying a = 18
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