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Simplifying 13 + -1x = 391 Solving 13 + -1x = 391 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -1x = 391 + -13 Combine like terms: 13 + -13 = 0 0 + -1x = 391 + -13 -1x = 391 + -13 Combine like terms: 391 + -13 = 378 -1x = 378 Divide each side by '-1'. x = -378 Simplifying x = -378
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