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Simplifying -21 + 28a = 7 Solving -21 + 28a = 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 + 28a = 7 + 21 Combine like terms: -21 + 21 = 0 0 + 28a = 7 + 21 28a = 7 + 21 Combine like terms: 7 + 21 = 28 28a = 28 Divide each side by '28'. a = 1 Simplifying a = 1
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