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Simplifying a + 13 = 2a Reorder the terms: 13 + a = 2a Solving 13 + a = 2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2a' to each side of the equation. 13 + a + -2a = 2a + -2a Combine like terms: a + -2a = -1a 13 + -1a = 2a + -2a Combine like terms: 2a + -2a = 0 13 + -1a = 0 Add '-13' to each side of the equation. 13 + -13 + -1a = 0 + -13 Combine like terms: 13 + -13 = 0 0 + -1a = 0 + -13 -1a = 0 + -13 Combine like terms: 0 + -13 = -13 -1a = -13 Divide each side by '-1'. a = 13 Simplifying a = 13
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