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Simplifying A * 2 + 4a + -21 = 0 Reorder the terms for easier multiplication: 2A + 4a + -21 = 0 Reorder the terms: -21 + 2A + 4a = 0 Solving -21 + 2A + 4a = 0 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 + 2A + 21 + 4a = 0 + 21 Reorder the terms: -21 + 21 + 2A + 4a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 2A + 4a = 0 + 21 2A + 4a = 0 + 21 Combine like terms: 0 + 21 = 21 2A + 4a = 21 Add '-4a' to each side of the equation. 2A + 4a + -4a = 21 + -4a Combine like terms: 4a + -4a = 0 2A + 0 = 21 + -4a 2A = 21 + -4a Divide each side by '2'. A = 10.5 + -2a Simplifying A = 10.5 + -2a
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