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Simplifying 9 + -2(4a + 2) = 21 Reorder the terms: 9 + -2(2 + 4a) = 21 9 + (2 * -2 + 4a * -2) = 21 9 + (-4 + -8a) = 21 Combine like terms: 9 + -4 = 5 5 + -8a = 21 Solving 5 + -8a = 21 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -8a = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -8a = 21 + -5 -8a = 21 + -5 Combine like terms: 21 + -5 = 16 -8a = 16 Divide each side by '-8'. a = -2 Simplifying a = -2
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