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Simplifying 3(20 + x) + -81 = 81 (20 * 3 + x * 3) + -81 = 81 (60 + 3x) + -81 = 81 Reorder the terms: 60 + -81 + 3x = 81 Combine like terms: 60 + -81 = -21 -21 + 3x = 81 Solving -21 + 3x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 3x = 81 + 21 Combine like terms: -21 + 21 = 0 0 + 3x = 81 + 21 3x = 81 + 21 Combine like terms: 81 + 21 = 102 3x = 102 Divide each side by '3'. x = 34 Simplifying x = 34
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