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Simplifying -4a + 4 + 5a = 12 + -21 Reorder the terms: 4 + -4a + 5a = 12 + -21 Combine like terms: -4a + 5a = 1a 4 + 1a = 12 + -21 Combine like terms: 12 + -21 = -9 4 + 1a = -9 Solving 4 + 1a = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + 1a = -9 + -4 Combine like terms: 4 + -4 = 0 0 + 1a = -9 + -4 1a = -9 + -4 Combine like terms: -9 + -4 = -13 1a = -13 Divide each side by '1'. a = -13 Simplifying a = -13
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