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Simplifying 3a + -1(1 + -1a) = 15 3a + (1 * -1 + -1a * -1) = 15 3a + (-1 + 1a) = 15 Reorder the terms: -1 + 3a + 1a = 15 Combine like terms: 3a + 1a = 4a -1 + 4a = 15 Solving -1 + 4a = 15 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 4a = 15 + 1 Combine like terms: -1 + 1 = 0 0 + 4a = 15 + 1 4a = 15 + 1 Combine like terms: 15 + 1 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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