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Simplifying -1a + -1(-3a) + -6 = 18 Remove parenthesis around (-3a) -1a + -1 * -3a + -6 = 18 Multiply -1 * -3 -1a + 3a + -6 = 18 Reorder the terms: -6 + -1a + 3a = 18 Combine like terms: -1a + 3a = 2a -6 + 2a = 18 Solving -6 + 2a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + 2a = 18 + 6 Combine like terms: -6 + 6 = 0 0 + 2a = 18 + 6 2a = 18 + 6 Combine like terms: 18 + 6 = 24 2a = 24 Divide each side by '2'. a = 12 Simplifying a = 12
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