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Simplifying 4a + 9 = a + 13 Reorder the terms: 9 + 4a = a + 13 Reorder the terms: 9 + 4a = 13 + a Solving 9 + 4a = 13 + 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. 9 + 4a + -1a = 13 + a + -1a Combine like terms: 4a + -1a = 3a 9 + 3a = 13 + a + -1a Combine like terms: a + -1a = 0 9 + 3a = 13 + 0 9 + 3a = 13 Add '-9' to each side of the equation. 9 + -9 + 3a = 13 + -9 Combine like terms: 9 + -9 = 0 0 + 3a = 13 + -9 3a = 13 + -9 Combine like terms: 13 + -9 = 4 3a = 4 Divide each side by '3'. a = 1.333333333 Simplifying a = 1.333333333
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