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Simplifying -3a + -1(2a + 1) = 9 Reorder the terms: -3a + -1(1 + 2a) = 9 -3a + (1 * -1 + 2a * -1) = 9 -3a + (-1 + -2a) = 9 Reorder the terms: -1 + -3a + -2a = 9 Combine like terms: -3a + -2a = -5a -1 + -5a = 9 Solving -1 + -5a = 9 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 + -5a = 9 + 1 Combine like terms: -1 + 1 = 0 0 + -5a = 9 + 1 -5a = 9 + 1 Combine like terms: 9 + 1 = 10 -5a = 10 Divide each side by '-5'. a = -2 Simplifying a = -2
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