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Simplifying 7(5a + 3 + -2a) = 28 Reorder the terms: 7(3 + 5a + -2a) = 28 Combine like terms: 5a + -2a = 3a 7(3 + 3a) = 28 (3 * 7 + 3a * 7) = 28 (21 + 21a) = 28 Solving 21 + 21a = 28 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 21a = 28 + -21 Combine like terms: 21 + -21 = 0 0 + 21a = 28 + -21 21a = 28 + -21 Combine like terms: 28 + -21 = 7 21a = 7 Divide each side by '21'. a = 0.3333333333 Simplifying a = 0.3333333333
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