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Simplifying -7a + 4(2.5 + 2a) = 13.5 -7a + (2.5 * 4 + 2a * 4) = 13.5 -7a + (10 + 8a) = 13.5 Reorder the terms: 10 + -7a + 8a = 13.5 Combine like terms: -7a + 8a = 1a 10 + 1a = 13.5 Solving 10 + 1a = 13.5 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 1a = 13.5 + -10 Combine like terms: 10 + -10 = 0 0 + 1a = 13.5 + -10 1a = 13.5 + -10 Combine like terms: 13.5 + -10 = 3.5 1a = 3.5 Divide each side by '1'. a = 3.5 Simplifying a = 3.5
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