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Simplifying 7a + -4(a + -3) = 18 Reorder the terms: 7a + -4(-3 + a) = 18 7a + (-3 * -4 + a * -4) = 18 7a + (12 + -4a) = 18 Reorder the terms: 12 + 7a + -4a = 18 Combine like terms: 7a + -4a = 3a 12 + 3a = 18 Solving 12 + 3a = 18 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-12' to each side of the equation. 12 + -12 + 3a = 18 + -12 Combine like terms: 12 + -12 = 0 0 + 3a = 18 + -12 3a = 18 + -12 Combine like terms: 18 + -12 = 6 3a = 6 Divide each side by '3'. a = 2 Simplifying a = 2
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