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Simplifying 21 = 2(4a + 2) Reorder the terms: 21 = 2(2 + 4a) 21 = (2 * 2 + 4a * 2) 21 = (4 + 8a) Solving 21 = 4 + 8a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8a' to each side of the equation. 21 + -8a = 4 + 8a + -8a Combine like terms: 8a + -8a = 0 21 + -8a = 4 + 0 21 + -8a = 4 Add '-21' to each side of the equation. 21 + -21 + -8a = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -8a = 4 + -21 -8a = 4 + -21 Combine like terms: 4 + -21 = -17 -8a = -17 Divide each side by '-8'. a = 2.125 Simplifying a = 2.125
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