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Simplifying 7a + -3(a + -2) = 18 Reorder the terms: 7a + -3(-2 + a) = 18 7a + (-2 * -3 + a * -3) = 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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