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Simplifying 7a + 13 = 13 + a Reorder the terms: 13 + 7a = 13 + a Add '-13' to each side of the equation. 13 + -13 + 7a = 13 + -13 + a Combine like terms: 13 + -13 = 0 0 + 7a = 13 + -13 + a 7a = 13 + -13 + a Combine like terms: 13 + -13 = 0 7a = 0 + a 7a = a Solving 7a = 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. 7a + -1a = a + -1a Combine like terms: 7a + -1a = 6a 6a = a + -1a Combine like terms: a + -1a = 0 6a = 0 Divide each side by '6'. a = 0 Simplifying a = 0
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