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Simplifying -4(-7 + -3a) = 28 + -2a (-7 * -4 + -3a * -4) = 28 + -2a (28 + 12a) = 28 + -2a Add '-28' to each side of the equation. 28 + -28 + 12a = 28 + -28 + -2a Combine like terms: 28 + -28 = 0 0 + 12a = 28 + -28 + -2a 12a = 28 + -28 + -2a Combine like terms: 28 + -28 = 0 12a = 0 + -2a 12a = -2a Solving 12a = -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 12a + 2a = -2a + 2a Combine like terms: 12a + 2a = 14a 14a = -2a + 2a Combine like terms: -2a + 2a = 0 14a = 0 Divide each side by '14'. a = 0 Simplifying a = 0
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