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Simplifying 81 = 7x + 4x + -7 Reorder the terms: 81 = -7 + 7x + 4x Combine like terms: 7x + 4x = 11x 81 = -7 + 11x Solving 81 = -7 + 11x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-11x' to each side of the equation. 81 + -11x = -7 + 11x + -11x Combine like terms: 11x + -11x = 0 81 + -11x = -7 + 0 81 + -11x = -7 Add '-81' to each side of the equation. 81 + -81 + -11x = -7 + -81 Combine like terms: 81 + -81 = 0 0 + -11x = -7 + -81 -11x = -7 + -81 Combine like terms: -7 + -81 = -88 -11x = -88 Divide each side by '-11'. x = 8 Simplifying x = 8
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