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Simplifying a + 42 = 126 Reorder the terms: 42 + a = 126 Solving 42 + a = 126 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + a = 126 + -42 Combine like terms: 42 + -42 = 0 0 + a = 126 + -42 a = 126 + -42 Combine like terms: 126 + -42 = 84 a = 84 Simplifying a = 84
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