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Simplifying 9a + -18 + 84 = 84 Reorder the terms: -18 + 84 + 9a = 84 Combine like terms: -18 + 84 = 66 66 + 9a = 84 Solving 66 + 9a = 84 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-66' to each side of the equation. 66 + -66 + 9a = 84 + -66 Combine like terms: 66 + -66 = 0 0 + 9a = 84 + -66 9a = 84 + -66 Combine like terms: 84 + -66 = 18 9a = 18 Divide each side by '9'. a = 2 Simplifying a = 2
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