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Simplifying 81 + -4x = 2x + 15 Reorder the terms: 81 + -4x = 15 + 2x Solving 81 + -4x = 15 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. 81 + -4x + -2x = 15 + 2x + -2x Combine like terms: -4x + -2x = -6x 81 + -6x = 15 + 2x + -2x Combine like terms: 2x + -2x = 0 81 + -6x = 15 + 0 81 + -6x = 15 Add '-81' to each side of the equation. 81 + -81 + -6x = 15 + -81 Combine like terms: 81 + -81 = 0 0 + -6x = 15 + -81 -6x = 15 + -81 Combine like terms: 15 + -81 = -66 -6x = -66 Divide each side by '-6'. x = 11 Simplifying x = 11
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