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