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Simplifying 5 + -1a2 = 21 Solving 5 + -1a2 = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -1a2 = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -1a2 = 21 + -5 -1a2 = 21 + -5 Combine like terms: 21 + -5 = 16 -1a2 = 16 Divide each side by '-1'. a2 = -16 Simplifying a2 = -16 Reorder the terms: 16 + a2 = -16 + 16 Combine like terms: -16 + 16 = 0 16 + a2 = 0 The solution to this equation could not be determined.
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