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Simplifying -9a + (-18a) + 18a + -1(-8a) + -9 = 11 Remove parenthesis around (-8a) -9a + (-18a) + 18a + -1 * -8a + -9 = 11 Multiply -1 * -8 -9a + (-18a) + 18a + 8a + -9 = 11 Reorder the terms: -9 + -9a + (-18a) + 18a + 8a = 11 Combine like terms: -9a + (-18a) = -27a -9 + -27a + 18a + 8a = 11 Combine like terms: -27a + 18a = -9a -9 + -9a + 8a = 11 Combine like terms: -9a + 8a = -1a -9 + -1a = 11 Solving -9 + -1a = 11 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + -1a = 11 + 9 Combine like terms: -9 + 9 = 0 0 + -1a = 11 + 9 -1a = 11 + 9 Combine like terms: 11 + 9 = 20 -1a = 20 Divide each side by '-1'. a = -20 Simplifying a = -20
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