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Simplifying -5[4a + 6] = -21 Reorder the terms: -5[6 + 4a] = -21 [6 * -5 + 4a * -5] = -21 [-30 + -20a] = -21 Solving -30 + -20a = -21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + -20a = -21 + 30 Combine like terms: -30 + 30 = 0 0 + -20a = -21 + 30 -20a = -21 + 30 Combine like terms: -21 + 30 = 9 -20a = 9 Divide each side by '-20'. a = -0.45 Simplifying a = -0.45
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