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Simplifying 81 = x + -19 Reorder the terms: 81 = -19 + x Solving 81 = -19 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 81 + -1x = -19 + x + -1x Combine like terms: x + -1x = 0 81 + -1x = -19 + 0 81 + -1x = -19 Add '-81' to each side of the equation. 81 + -81 + -1x = -19 + -81 Combine like terms: 81 + -81 = 0 0 + -1x = -19 + -81 -1x = -19 + -81 Combine like terms: -19 + -81 = -100 -1x = -100 Divide each side by '-1'. x = 100 Simplifying x = 100

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