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Simplifying 15 + -1a2 = 21 Solving 15 + -1a2 = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + -1a2 = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -1a2 = 21 + -15 -1a2 = 21 + -15 Combine like terms: 21 + -15 = 6 -1a2 = 6 Divide each side by '-1'. a2 = -6 Simplifying a2 = -6 Reorder the terms: 6 + a2 = -6 + 6 Combine like terms: -6 + 6 = 0 6 + a2 = 0 The solution to this equation could not be determined.
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