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Simplifying 7a + -1(3a + -6) = 18 Reorder the terms: 7a + -1(-6 + 3a) = 18 7a + (-6 * -1 + 3a * -1) = 18 7a + (6 + -3a) = 18 Reorder the terms: 6 + 7a + -3a = 18 Combine like terms: 7a + -3a = 4a 6 + 4a = 18 Solving 6 + 4a = 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 + 4a = 18 + -6 Combine like terms: 6 + -6 = 0 0 + 4a = 18 + -6 4a = 18 + -6 Combine like terms: 18 + -6 = 12 4a = 12 Divide each side by '4'. a = 3 Simplifying a = 3
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