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Simplifying 3(2a + 7) + -3a = 18 Reorder the terms: 3(7 + 2a) + -3a = 18 (7 * 3 + 2a * 3) + -3a = 18 (21 + 6a) + -3a = 18 Combine like terms: 6a + -3a = 3a 21 + 3a = 18 Solving 21 + 3a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 3a = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 3a = 18 + -21 3a = 18 + -21 Combine like terms: 18 + -21 = -3 3a = -3 Divide each side by '3'. a = -1 Simplifying a = -1
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