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Simplifying 2a + -5(a + -4) = -4 Reorder the terms: 2a + -5(-4 + a) = -4 2a + (-4 * -5 + a * -5) = -4 2a + (20 + -5a) = -4 Reorder the terms: 20 + 2a + -5a = -4 Combine like terms: 2a + -5a = -3a 20 + -3a = -4 Solving 20 + -3a = -4 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 + -3a = -4 + -20 Combine like terms: 20 + -20 = 0 0 + -3a = -4 + -20 -3a = -4 + -20 Combine like terms: -4 + -20 = -24 -3a = -24 Divide each side by '-3'. a = 8 Simplifying a = 8
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