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Simplifying 2a + -7 = 21 Reorder the terms: -7 + 2a = 21 Solving -7 + 2a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + 2a = 21 + 7 Combine like terms: -7 + 7 = 0 0 + 2a = 21 + 7 2a = 21 + 7 Combine like terms: 21 + 7 = 28 2a = 28 Divide each side by '2'. a = 14 Simplifying a = 14
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