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Simplifying 63 = 9(a + -7) Reorder the terms: 63 = 9(-7 + a) 63 = (-7 * 9 + a * 9) 63 = (-63 + 9a) Solving 63 = -63 + 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 = -63 + 9a + -9a Combine like terms: 9a + -9a = 0 63 + -9a = -63 + 0 63 + -9a = -63 Add '-63' to each side of the equation. 63 + -63 + -9a = -63 + -63 Combine like terms: 63 + -63 = 0 0 + -9a = -63 + -63 -9a = -63 + -63 Combine like terms: -63 + -63 = -126 -9a = -126 Divide each side by '-9'. a = 14 Simplifying a = 14
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