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Simplifying 81 = 4x + 5(-1x + 18) Reorder the terms: 81 = 4x + 5(18 + -1x) 81 = 4x + (18 * 5 + -1x * 5) 81 = 4x + (90 + -5x) Reorder the terms: 81 = 90 + 4x + -5x Combine like terms: 4x + -5x = -1x 81 = 90 + -1x Solving 81 = 90 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 81 + x = 90 + -1x + x Combine like terms: -1x + x = 0 81 + x = 90 + 0 81 + x = 90 Add '-81' to each side of the equation. 81 + -81 + x = 90 + -81 Combine like terms: 81 + -81 = 0 0 + x = 90 + -81 x = 90 + -81 Combine like terms: 90 + -81 = 9 x = 9 Simplifying x = 9
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