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Simplifying -20 = 2a + -1(6 + 4a) -20 = 2a + (6 * -1 + 4a * -1) -20 = 2a + (-6 + -4a) Reorder the terms: -20 = -6 + 2a + -4a Combine like terms: 2a + -4a = -2a -20 = -6 + -2a Solving -20 = -6 + -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 = -6 + -2a + 2a Combine like terms: -2a + 2a = 0 -20 + 2a = -6 + 0 -20 + 2a = -6 Add '20' to each side of the equation. -20 + 20 + 2a = -6 + 20 Combine like terms: -20 + 20 = 0 0 + 2a = -6 + 20 2a = -6 + 20 Combine like terms: -6 + 20 = 14 2a = 14 Divide each side by '2'. a = 7 Simplifying a = 7
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