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Simplifying 84 = 4(-3a + 3) Reorder the terms: 84 = 4(3 + -3a) 84 = (3 * 4 + -3a * 4) 84 = (12 + -12a) Solving 84 = 12 + -12a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '12a' to each side of the equation. 84 + 12a = 12 + -12a + 12a Combine like terms: -12a + 12a = 0 84 + 12a = 12 + 0 84 + 12a = 12 Add '-84' to each side of the equation. 84 + -84 + 12a = 12 + -84 Combine like terms: 84 + -84 = 0 0 + 12a = 12 + -84 12a = 12 + -84 Combine like terms: 12 + -84 = -72 12a = -72 Divide each side by '12'. a = -6 Simplifying a = -6
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