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Simplifying 7[a + 3] = 28 Reorder the terms: 7[3 + a] = 28 [3 * 7 + a * 7] = 28 [21 + 7a] = 28 Solving 21 + 7a = 28 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 + 7a = 28 + -21 Combine like terms: 21 + -21 = 0 0 + 7a = 28 + -21 7a = 28 + -21 Combine like terms: 28 + -21 = 7 7a = 7 Divide each side by '7'. a = 1 Simplifying a = 1
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