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Simplifying 81 + -5x = 7x + 21 Reorder the terms: 81 + -5x = 21 + 7x Solving 81 + -5x = 21 + 7x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7x' to each side of the equation. 81 + -5x + -7x = 21 + 7x + -7x Combine like terms: -5x + -7x = -12x 81 + -12x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 81 + -12x = 21 + 0 81 + -12x = 21 Add '-81' to each side of the equation. 81 + -81 + -12x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -12x = 21 + -81 -12x = 21 + -81 Combine like terms: 21 + -81 = -60 -12x = -60 Divide each side by '-12'. x = 5 Simplifying x = 5
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