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Simplifying 8(a + b) + 3z = -9 (a * 8 + b * 8) + 3z = -9 (8a + 8b) + 3z = -9 Solving 8a + 8b + 3z = -9 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-8b' to each side of the equation. 8a + 8b + -8b + 3z = -9 + -8b Combine like terms: 8b + -8b = 0 8a + 0 + 3z = -9 + -8b 8a + 3z = -9 + -8b Add '-3z' to each side of the equation. 8a + 3z + -3z = -9 + -8b + -3z Combine like terms: 3z + -3z = 0 8a + 0 = -9 + -8b + -3z 8a = -9 + -8b + -3z Divide each side by '8'. a = -1.125 + -1b + -0.375z Simplifying a = -1.125 + -1b + -0.375z
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