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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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