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Simplifying 4a + -7[2 + -21a + -14] = 0 Reorder the terms: 4a + -7[2 + -14 + -21a] = 0 Combine like terms: 2 + -14 = -12 4a + -7[-12 + -21a] = 0 4a + [-12 * -7 + -21a * -7] = 0 4a + [84 + 147a] = 0 Reorder the terms: 84 + 4a + 147a = 0 Combine like terms: 4a + 147a = 151a 84 + 151a = 0 Solving 84 + 151a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 151a = 0 + -84 Combine like terms: 84 + -84 = 0 0 + 151a = 0 + -84 151a = 0 + -84 Combine like terms: 0 + -84 = -84 151a = -84 Divide each side by '151'. a = -0.5562913907 Simplifying a = -0.5562913907
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