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Simplifying -5a + 4(2 + 2a) = 28 -5a + (2 * 4 + 2a * 4) = 28 -5a + (8 + 8a) = 28 Reorder the terms: 8 + -5a + 8a = 28 Combine like terms: -5a + 8a = 3a 8 + 3a = 28 Solving 8 + 3a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 3a = 28 + -8 Combine like terms: 8 + -8 = 0 0 + 3a = 28 + -8 3a = 28 + -8 Combine like terms: 28 + -8 = 20 3a = 20 Divide each side by '3'. a = 6.666666667 Simplifying a = 6.666666667
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