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Simplifying 3a + 15 + a = 13 Reorder the terms: 15 + 3a + a = 13 Combine like terms: 3a + a = 4a 15 + 4a = 13 Solving 15 + 4a = 13 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 4a = 13 + -15 Combine like terms: 15 + -15 = 0 0 + 4a = 13 + -15 4a = 13 + -15 Combine like terms: 13 + -15 = -2 4a = -2 Divide each side by '4'. a = -0.5 Simplifying a = -0.5
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