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Simplifying 63 = 9[2 + -1a] 63 = [2 * 9 + -1a * 9] 63 = [18 + -9a] Solving 63 = 18 + -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. 63 + 9a = 18 + -9a + 9a Combine like terms: -9a + 9a = 0 63 + 9a = 18 + 0 63 + 9a = 18 Add '-63' to each side of the equation. 63 + -63 + 9a = 18 + -63 Combine like terms: 63 + -63 = 0 0 + 9a = 18 + -63 9a = 18 + -63 Combine like terms: 18 + -63 = -45 9a = -45 Divide each side by '9'. a = -5 Simplifying a = -5
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