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Simplifying 7a + 3(9 + 5a) = a 7a + (9 * 3 + 5a * 3) = a 7a + (27 + 15a) = a Reorder the terms: 27 + 7a + 15a = a Combine like terms: 7a + 15a = 22a 27 + 22a = a Solving 27 + 22a = a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1a' to each side of the equation. 27 + 22a + -1a = a + -1a Combine like terms: 22a + -1a = 21a 27 + 21a = a + -1a Combine like terms: a + -1a = 0 27 + 21a = 0 Add '-27' to each side of the equation. 27 + -27 + 21a = 0 + -27 Combine like terms: 27 + -27 = 0 0 + 21a = 0 + -27 21a = 0 + -27 Combine like terms: 0 + -27 = -27 21a = -27 Divide each side by '21'. a = -1.285714286 Simplifying a = -1.285714286
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