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Simplifying -1(12 + 3a) = -12(1 + -2a) + 3a (12 * -1 + 3a * -1) = -12(1 + -2a) + 3a (-12 + -3a) = -12(1 + -2a) + 3a -12 + -3a = (1 * -12 + -2a * -12) + 3a -12 + -3a = (-12 + 24a) + 3a Combine like terms: 24a + 3a = 27a -12 + -3a = -12 + 27a Add '12' to each side of the equation. -12 + 12 + -3a = -12 + 12 + 27a Combine like terms: -12 + 12 = 0 0 + -3a = -12 + 12 + 27a -3a = -12 + 12 + 27a Combine like terms: -12 + 12 = 0 -3a = 0 + 27a -3a = 27a Solving -3a = 27a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-27a' to each side of the equation. -3a + -27a = 27a + -27a Combine like terms: -3a + -27a = -30a -30a = 27a + -27a Combine like terms: 27a + -27a = 0 -30a = 0 Divide each side by '-30'. a = 0.0 Simplifying a = 0.0
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