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Simplifying a + 138 + 145 + a + 49 + a + -29 = 540 Reorder the terms: 138 + 145 + 49 + -29 + a + a + a = 540 Combine like terms: 138 + 145 = 283 283 + 49 + -29 + a + a + a = 540 Combine like terms: 283 + 49 = 332 332 + -29 + a + a + a = 540 Combine like terms: 332 + -29 = 303 303 + a + a + a = 540 Combine like terms: a + a = 2a 303 + 2a + a = 540 Combine like terms: 2a + a = 3a 303 + 3a = 540 Solving 303 + 3a = 540 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-303' to each side of the equation. 303 + -303 + 3a = 540 + -303 Combine like terms: 303 + -303 = 0 0 + 3a = 540 + -303 3a = 540 + -303 Combine like terms: 540 + -303 = 237 3a = 237 Divide each side by '3'. a = 79 Simplifying a = 79
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