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Simplifying -13 = -9 + -1a Solving -13 = -9 + -1a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add 'a' to each side of the equation. -13 + a = -9 + -1a + a Combine like terms: -1a + a = 0 -13 + a = -9 + 0 -13 + a = -9 Add '13' to each side of the equation. -13 + 13 + a = -9 + 13 Combine like terms: -13 + 13 = 0 0 + a = -9 + 13 a = -9 + 13 Combine like terms: -9 + 13 = 4 a = 4 Simplifying a = 4
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