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Simplifying 4(-2a + 5) = 84 Reorder the terms: 4(5 + -2a) = 84 (5 * 4 + -2a * 4) = 84 (20 + -8a) = 84 Solving 20 + -8a = 84 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + -8a = 84 + -20 Combine like terms: 20 + -20 = 0 0 + -8a = 84 + -20 -8a = 84 + -20 Combine like terms: 84 + -20 = 64 -8a = 64 Divide each side by '-8'. a = -8 Simplifying a = -8
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