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Simplifying 28 = 2(1 + a) 28 = (1 * 2 + a * 2) 28 = (2 + 2a) Solving 28 = 2 + 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. 28 + -2a = 2 + 2a + -2a Combine like terms: 2a + -2a = 0 28 + -2a = 2 + 0 28 + -2a = 2 Add '-28' to each side of the equation. 28 + -28 + -2a = 2 + -28 Combine like terms: 28 + -28 = 0 0 + -2a = 2 + -28 -2a = 2 + -28 Combine like terms: 2 + -28 = -26 -2a = -26 Divide each side by '-2'. a = 13 Simplifying a = 13
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