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Simplifying 20 + -4a = -2(a + -8) Reorder the terms: 20 + -4a = -2(-8 + a) 20 + -4a = (-8 * -2 + a * -2) 20 + -4a = (16 + -2a) Solving 20 + -4a = 16 + -2a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2a' to each side of the equation. 20 + -4a + 2a = 16 + -2a + 2a Combine like terms: -4a + 2a = -2a 20 + -2a = 16 + -2a + 2a Combine like terms: -2a + 2a = 0 20 + -2a = 16 + 0 20 + -2a = 16 Add '-20' to each side of the equation. 20 + -20 + -2a = 16 + -20 Combine like terms: 20 + -20 = 0 0 + -2a = 16 + -20 -2a = 16 + -20 Combine like terms: 16 + -20 = -4 -2a = -4 Divide each side by '-2'. a = 2 Simplifying a = 2
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