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Simplifying 7a + -1(3a + -2) = 18 Reorder the terms: 7a + -1(-2 + 3a) = 18 7a + (-2 * -1 + 3a * -1) = 18 7a + (2 + -3a) = 18 Reorder the terms: 2 + 7a + -3a = 18 Combine like terms: 7a + -3a = 4a 2 + 4a = 18 Solving 2 + 4a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 4a = 18 + -2 Combine like terms: 2 + -2 = 0 0 + 4a = 18 + -2 4a = 18 + -2 Combine like terms: 18 + -2 = 16 4a = 16 Divide each side by '4'. a = 4 Simplifying a = 4
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