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Simplifying -3(a + 1) + 3(1 + -2a) = 18 Reorder the terms: -3(1 + a) + 3(1 + -2a) = 18 (1 * -3 + a * -3) + 3(1 + -2a) = 18 (-3 + -3a) + 3(1 + -2a) = 18 -3 + -3a + (1 * 3 + -2a * 3) = 18 -3 + -3a + (3 + -6a) = 18 Reorder the terms: -3 + 3 + -3a + -6a = 18 Combine like terms: -3 + 3 = 0 0 + -3a + -6a = 18 -3a + -6a = 18 Combine like terms: -3a + -6a = -9a -9a = 18 Solving -9a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Divide each side by '-9'. a = -2 Simplifying a = -2
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