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Simplifying -20 = 2(a + -11) Reorder the terms: -20 = 2(-11 + a) -20 = (-11 * 2 + a * 2) -20 = (-22 + 2a) Solving -20 = -22 + 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 = -22 + 2a + -2a Combine like terms: 2a + -2a = 0 -20 + -2a = -22 + 0 -20 + -2a = -22 Add '20' to each side of the equation. -20 + 20 + -2a = -22 + 20 Combine like terms: -20 + 20 = 0 0 + -2a = -22 + 20 -2a = -22 + 20 Combine like terms: -22 + 20 = -2 -2a = -2 Divide each side by '-2'. a = 1 Simplifying a = 1
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