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Simplifying 20 = -3(a + -3) + 2 Reorder the terms: 20 = -3(-3 + a) + 2 20 = (-3 * -3 + a * -3) + 2 20 = (9 + -3a) + 2 Reorder the terms: 20 = 9 + 2 + -3a Combine like terms: 9 + 2 = 11 20 = 11 + -3a Solving 20 = 11 + -3a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '3a' to each side of the equation. 20 + 3a = 11 + -3a + 3a Combine like terms: -3a + 3a = 0 20 + 3a = 11 + 0 20 + 3a = 11 Add '-20' to each side of the equation. 20 + -20 + 3a = 11 + -20 Combine like terms: 20 + -20 = 0 0 + 3a = 11 + -20 3a = 11 + -20 Combine like terms: 11 + -20 = -9 3a = -9 Divide each side by '3'. a = -3 Simplifying a = -3
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