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