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Simplifying 27 + -1a = 18 Solving 27 + -1a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + -1a = 18 + -27 Combine like terms: 27 + -27 = 0 0 + -1a = 18 + -27 -1a = 18 + -27 Combine like terms: 18 + -27 = -9 -1a = -9 Divide each side by '-1'. a = 9 Simplifying a = 9
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