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Simplifying a4 + -21 = 7 Reorder the terms: -21 + a4 = 7 Solving -21 + a4 = 7 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + a4 = 7 + 21 Combine like terms: -21 + 21 = 0 0 + a4 = 7 + 21 a4 = 7 + 21 Combine like terms: 7 + 21 = 28 a4 = 28 Simplifying a4 = 28 Reorder the terms: -28 + a4 = 28 + -28 Combine like terms: 28 + -28 = 0 -28 + a4 = 0 The solution to this equation could not be determined.
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