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Simplifying 20 = 2(a + 6) Reorder the terms: 20 = 2(6 + a) 20 = (6 * 2 + a * 2) 20 = (12 + 2a) Solving 20 = 12 + 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. 20 + -2a = 12 + 2a + -2a Combine like terms: 2a + -2a = 0 20 + -2a = 12 + 0 20 + -2a = 12 Add '-20' to each side of the equation. 20 + -20 + -2a = 12 + -20 Combine like terms: 20 + -20 = 0 0 + -2a = 12 + -20 -2a = 12 + -20 Combine like terms: 12 + -20 = -8 -2a = -8 Divide each side by '-2'. a = 4 Simplifying a = 4
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