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Simplifying 7(a + 4) = 63 Reorder the terms: 7(4 + a) = 63 (4 * 7 + a * 7) = 63 (28 + 7a) = 63 Solving 28 + 7a = 63 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 7a = 63 + -28 Combine like terms: 28 + -28 = 0 0 + 7a = 63 + -28 7a = 63 + -28 Combine like terms: 63 + -28 = 35 7a = 35 Divide each side by '7'. a = 5 Simplifying a = 5
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