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Simplifying -20 = 2(-4 + a) -20 = (-4 * 2 + a * 2) -20 = (-8 + 2a) Solving -20 = -8 + 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 + -2a = -8 + 2a + -2a Combine like terms: 2a + -2a = 0 -20 + -2a = -8 + 0 -20 + -2a = -8 Add '20' to each side of the equation. -20 + 20 + -2a = -8 + 20 Combine like terms: -20 + 20 = 0 0 + -2a = -8 + 20 -2a = -8 + 20 Combine like terms: -8 + 20 = 12 -2a = 12 Divide each side by '-2'. a = -6 Simplifying a = -6
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