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Simplifying 7a + 18 + -6a = 142 Reorder the terms: 18 + 7a + -6a = 142 Combine like terms: 7a + -6a = 1a 18 + 1a = 142 Solving 18 + 1a = 142 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 1a = 142 + -18 Combine like terms: 18 + -18 = 0 0 + 1a = 142 + -18 1a = 142 + -18 Combine like terms: 142 + -18 = 124 1a = 124 Divide each side by '1'. a = 124 Simplifying a = 124
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