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Simplifying -5(4a + 3) + 21a = -3 Reorder the terms: -5(3 + 4a) + 21a = -3 (3 * -5 + 4a * -5) + 21a = -3 (-15 + -20a) + 21a = -3 Combine like terms: -20a + 21a = 1a -15 + 1a = -3 Solving -15 + 1a = -3 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 1a = -3 + 15 Combine like terms: -15 + 15 = 0 0 + 1a = -3 + 15 1a = -3 + 15 Combine like terms: -3 + 15 = 12 1a = 12 Divide each side by '1'. a = 12 Simplifying a = 12
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