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Simplifying 86 + 68 + 79 + x + 83 = 391 Reorder the terms: 86 + 68 + 79 + 83 + x = 391 Combine like terms: 86 + 68 = 154 154 + 79 + 83 + x = 391 Combine like terms: 154 + 79 = 233 233 + 83 + x = 391 Combine like terms: 233 + 83 = 316 316 + x = 391 Solving 316 + x = 391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-316' to each side of the equation. 316 + -316 + x = 391 + -316 Combine like terms: 316 + -316 = 0 0 + x = 391 + -316 x = 391 + -316 Combine like terms: 391 + -316 = 75 x = 75 Simplifying x = 75
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