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Simplifying -1a + 15 + 3a + 15 = -4 Reorder the terms: 15 + 15 + -1a + 3a = -4 Combine like terms: 15 + 15 = 30 30 + -1a + 3a = -4 Combine like terms: -1a + 3a = 2a 30 + 2a = -4 Solving 30 + 2a = -4 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 2a = -4 + -30 Combine like terms: 30 + -30 = 0 0 + 2a = -4 + -30 2a = -4 + -30 Combine like terms: -4 + -30 = -34 2a = -34 Divide each side by '2'. a = -17 Simplifying a = -17
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