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Simplifying 13 + -1a = 25 Solving 13 + -1a = 25 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -1a = 25 + -13 Combine like terms: 13 + -13 = 0 0 + -1a = 25 + -13 -1a = 25 + -13 Combine like terms: 25 + -13 = 12 -1a = 12 Divide each side by '-1'. a = -12 Simplifying a = -12
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