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Simplifying 9a + -2a + 84 = 168 Reorder the terms: 84 + 9a + -2a = 168 Combine like terms: 9a + -2a = 7a 84 + 7a = 168 Solving 84 + 7a = 168 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-84' to each side of the equation. 84 + -84 + 7a = 168 + -84 Combine like terms: 84 + -84 = 0 0 + 7a = 168 + -84 7a = 168 + -84 Combine like terms: 168 + -84 = 84 7a = 84 Divide each side by '7'. a = 12 Simplifying a = 12
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