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Simplifying 7(2a + 3 + -5a) = 28 Reorder the terms: 7(3 + 2a + -5a) = 28 Combine like terms: 2a + -5a = -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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