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Simplifying 2x + 42 + -3 = 81 Reorder the terms: 42 + -3 + 2x = 81 Combine like terms: 42 + -3 = 39 39 + 2x = 81 Solving 39 + 2x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 2x = 81 + -39 Combine like terms: 39 + -39 = 0 0 + 2x = 81 + -39 2x = 81 + -39 Combine like terms: 81 + -39 = 42 2x = 42 Divide each side by '2'. x = 21 Simplifying x = 21
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