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Simplifying 7a + -9(8 + 3a) = 0 7a + (8 * -9 + 3a * -9) = 0 7a + (-72 + -27a) = 0 Reorder the terms: -72 + 7a + -27a = 0 Combine like terms: 7a + -27a = -20a -72 + -20a = 0 Solving -72 + -20a = 0 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '72' to each side of the equation. -72 + 72 + -20a = 0 + 72 Combine like terms: -72 + 72 = 0 0 + -20a = 0 + 72 -20a = 0 + 72 Combine like terms: 0 + 72 = 72 -20a = 72 Divide each side by '-20'. a = -3.6 Simplifying a = -3.6
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