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Simplifying 21 = 2(4a + 20) Reorder the terms: 21 = 2(20 + 4a) 21 = (20 * 2 + 4a * 2) 21 = (40 + 8a) Solving 21 = 40 + 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 = 40 + 8a + -8a Combine like terms: 8a + -8a = 0 21 + -8a = 40 + 0 21 + -8a = 40 Add '-21' to each side of the equation. 21 + -21 + -8a = 40 + -21 Combine like terms: 21 + -21 = 0 0 + -8a = 40 + -21 -8a = 40 + -21 Combine like terms: 40 + -21 = 19 -8a = 19 Divide each side by '-8'. a = -2.375 Simplifying a = -2.375
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