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Simplifying 81 + -3x = 7x + 21 Reorder the terms: 81 + -3x = 21 + 7x Solving 81 + -3x = 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 + -3x + -7x = 21 + 7x + -7x Combine like terms: -3x + -7x = -10x 81 + -10x = 21 + 7x + -7x Combine like terms: 7x + -7x = 0 81 + -10x = 21 + 0 81 + -10x = 21 Add '-81' to each side of the equation. 81 + -81 + -10x = 21 + -81 Combine like terms: 81 + -81 = 0 0 + -10x = 21 + -81 -10x = 21 + -81 Combine like terms: 21 + -81 = -60 -10x = -60 Divide each side by '-10'. x = 6 Simplifying x = 6
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