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Simplifying 7x + -81 = 31 + 3x Reorder the terms: -81 + 7x = 31 + 3x Solving -81 + 7x = 31 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -81 + 7x + -3x = 31 + 3x + -3x Combine like terms: 7x + -3x = 4x -81 + 4x = 31 + 3x + -3x Combine like terms: 3x + -3x = 0 -81 + 4x = 31 + 0 -81 + 4x = 31 Add '81' to each side of the equation. -81 + 81 + 4x = 31 + 81 Combine like terms: -81 + 81 = 0 0 + 4x = 31 + 81 4x = 31 + 81 Combine like terms: 31 + 81 = 112 4x = 112 Divide each side by '4'. x = 28 Simplifying x = 28
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