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Simplifying 81 + -2x = 2x + 21 Reorder the terms: 81 + -2x = 21 + 2x Solving 81 + -2x = 21 + 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 + -2x + -2x = 21 + 2x + -2x Combine like terms: -2x + -2x = -4x 81 + -4x = 21 + 2x + -2x Combine like terms: 2x + -2x = 0 81 + -4x = 21 + 0 81 + -4x = 21 Add '-81' to each side of the equation. 81 + -81 + -4x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -4x = 21 + -81 -4x = 21 + -81 Combine like terms: 21 + -81 = -60 -4x = -60 Divide each side by '-4'. x = 15 Simplifying x = 15
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