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Simplifying 2a + -3 = 21 Reorder the terms: -3 + 2a = 21 Solving -3 + 2a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + 2a = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 2a = 21 + 3 2a = 21 + 3 Combine like terms: 21 + 3 = 24 2a = 24 Divide each side by '2'. a = 12 Simplifying a = 12
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