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Simplifying -21 + 2a = 13 Solving -21 + 2a = 13 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 + 2a = 13 + 21 Combine like terms: -21 + 21 = 0 0 + 2a = 13 + 21 2a = 13 + 21 Combine like terms: 13 + 21 = 34 2a = 34 Divide each side by '2'. a = 17 Simplifying a = 17
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