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Simplifying 5a + 3a + -5a + -3 = 81 Reorder the terms: -3 + 5a + 3a + -5a = 81 Combine like terms: 5a + 3a = 8a -3 + 8a + -5a = 81 Combine like terms: 8a + -5a = 3a -3 + 3a = 81 Solving -3 + 3a = 81 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 3a = 81 + 3 Combine like terms: -3 + 3 = 0 0 + 3a = 81 + 3 3a = 81 + 3 Combine like terms: 81 + 3 = 84 3a = 84 Divide each side by '3'. a = 28 Simplifying a = 28
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