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Simplifying -2(4a + 3) + -5(2 + -1a) = 3(2a + 3) + 7 Reorder the terms: -2(3 + 4a) + -5(2 + -1a) = 3(2a + 3) + 7 (3 * -2 + 4a * -2) + -5(2 + -1a) = 3(2a + 3) + 7 (-6 + -8a) + -5(2 + -1a) = 3(2a + 3) + 7 -6 + -8a + (2 * -5 + -1a * -5) = 3(2a + 3) + 7 -6 + -8a + (-10 + 5a) = 3(2a + 3) + 7 Reorder the terms: -6 + -10 + -8a + 5a = 3(2a + 3) + 7 Combine like terms: -6 + -10 = -16 -16 + -8a + 5a = 3(2a + 3) + 7 Combine like terms: -8a + 5a = -3a -16 + -3a = 3(2a + 3) + 7 Reorder the terms: -16 + -3a = 3(3 + 2a) + 7 -16 + -3a = (3 * 3 + 2a * 3) + 7 -16 + -3a = (9 + 6a) + 7 Reorder the terms: -16 + -3a = 9 + 7 + 6a Combine like terms: 9 + 7 = 16 -16 + -3a = 16 + 6a Solving -16 + -3a = 16 + 6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6a' to each side of the equation. -16 + -3a + -6a = 16 + 6a + -6a Combine like terms: -3a + -6a = -9a -16 + -9a = 16 + 6a + -6a Combine like terms: 6a + -6a = 0 -16 + -9a = 16 + 0 -16 + -9a = 16 Add '16' to each side of the equation. -16 + 16 + -9a = 16 + 16 Combine like terms: -16 + 16 = 0 0 + -9a = 16 + 16 -9a = 16 + 16 Combine like terms: 16 + 16 = 32 -9a = 32 Divide each side by '-9'. a = -3.555555556 Simplifying a = -3.555555556
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