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Simplifying 8 + -1(21 + 3) + -1(5 + -9a) = 0 Combine like terms: 21 + 3 = 24 8 + -1(24) + -1(5 + -9a) = 0 Multiply -1 * 24 8 + -24 + -1(5 + -9a) = 0 8 + -24 + (5 * -1 + -9a * -1) = 0 8 + -24 + (-5 + 9a) = 0 Combine like terms: 8 + -24 = -16 -16 + -5 + 9a = 0 Combine like terms: -16 + -5 = -21 -21 + 9a = 0 Solving -21 + 9a = 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 + 21 + 9a = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 9a = 0 + 21 9a = 0 + 21 Combine like terms: 0 + 21 = 21 9a = 21 Divide each side by '9'. a = 2.333333333 Simplifying a = 2.333333333
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