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Simplifying 9 = a + [-9] 9 = a + -9 Reorder the terms: 9 = -9 + a Solving 9 = -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. 9 + -1a = -9 + a + -1a Combine like terms: a + -1a = 0 9 + -1a = -9 + 0 9 + -1a = -9 Add '-9' to each side of the equation. 9 + -9 + -1a = -9 + -9 Combine like terms: 9 + -9 = 0 0 + -1a = -9 + -9 -1a = -9 + -9 Combine like terms: -9 + -9 = -18 -1a = -18 Divide each side by '-1'. a = 18 Simplifying a = 18
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