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Simplifying 5a + -4(a + -3) = 21 Reorder the terms: 5a + -4(-3 + a) = 21 5a + (-3 * -4 + a * -4) = 21 5a + (12 + -4a) = 21 Reorder the terms: 12 + 5a + -4a = 21 Combine like terms: 5a + -4a = 1a 12 + 1a = 21 Solving 12 + 1a = 21 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 + 1a = 21 + -12 Combine like terms: 12 + -12 = 0 0 + 1a = 21 + -12 1a = 21 + -12 Combine like terms: 21 + -12 = 9 1a = 9 Divide each side by '1'. a = 9 Simplifying a = 9
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