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Simplifying 207 = -9(a + -3) Reorder the terms: 207 = -9(-3 + a) 207 = (-3 * -9 + a * -9) 207 = (27 + -9a) Solving 207 = 27 + -9a Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '9a' to each side of the equation. 207 + 9a = 27 + -9a + 9a Combine like terms: -9a + 9a = 0 207 + 9a = 27 + 0 207 + 9a = 27 Add '-207' to each side of the equation. 207 + -207 + 9a = 27 + -207 Combine like terms: 207 + -207 = 0 0 + 9a = 27 + -207 9a = 27 + -207 Combine like terms: 27 + -207 = -180 9a = -180 Divide each side by '9'. a = -20 Simplifying a = -20
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