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Simplifying 81 = 4x + -19 Reorder the terms: 81 = -19 + 4x Solving 81 = -19 + 4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4x' to each side of the equation. 81 + -4x = -19 + 4x + -4x Combine like terms: 4x + -4x = 0 81 + -4x = -19 + 0 81 + -4x = -19 Add '-81' to each side of the equation. 81 + -81 + -4x = -19 + -81 Combine like terms: 81 + -81 = 0 0 + -4x = -19 + -81 -4x = -19 + -81 Combine like terms: -19 + -81 = -100 -4x = -100 Divide each side by '-4'. x = 25 Simplifying x = 25
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