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Simplifying 21 = 3(2a + 3) Reorder the terms: 21 = 3(3 + 2a) 21 = (3 * 3 + 2a * 3) 21 = (9 + 6a) Solving 21 = 9 + 6a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-6a' to each side of the equation. 21 + -6a = 9 + 6a + -6a Combine like terms: 6a + -6a = 0 21 + -6a = 9 + 0 21 + -6a = 9 Add '-21' to each side of the equation. 21 + -21 + -6a = 9 + -21 Combine like terms: 21 + -21 = 0 0 + -6a = 9 + -21 -6a = 9 + -21 Combine like terms: 9 + -21 = -12 -6a = -12 Divide each side by '-6'. a = 2 Simplifying a = 2
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