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Simplifying 20 = 2 + -5(9 + -1a) 20 = 2 + (9 * -5 + -1a * -5) 20 = 2 + (-45 + 5a) Combine like terms: 2 + -45 = -43 20 = -43 + 5a Solving 20 = -43 + 5a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-5a' to each side of the equation. 20 + -5a = -43 + 5a + -5a Combine like terms: 5a + -5a = 0 20 + -5a = -43 + 0 20 + -5a = -43 Add '-20' to each side of the equation. 20 + -20 + -5a = -43 + -20 Combine like terms: 20 + -20 = 0 0 + -5a = -43 + -20 -5a = -43 + -20 Combine like terms: -43 + -20 = -63 -5a = -63 Divide each side by '-5'. a = 12.6 Simplifying a = 12.6
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