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Simplifying -13 = 1a + -4 + 8a Reorder the terms: -13 = -4 + 1a + 8a Combine like terms: 1a + 8a = 9a -13 = -4 + 9a Solving -13 = -4 + 9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-9a' to each side of the equation. -13 + -9a = -4 + 9a + -9a Combine like terms: 9a + -9a = 0 -13 + -9a = -4 + 0 -13 + -9a = -4 Add '13' to each side of the equation. -13 + 13 + -9a = -4 + 13 Combine like terms: -13 + 13 = 0 0 + -9a = -4 + 13 -9a = -4 + 13 Combine like terms: -4 + 13 = 9 -9a = 9 Divide each side by '-9'. a = -1 Simplifying a = -1
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