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Simplifying -12 + 3x + -72 = 81 Reorder the terms: -12 + -72 + 3x = 81 Combine like terms: -12 + -72 = -84 -84 + 3x = 81 Solving -84 + 3x = 81 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '84' to each side of the equation. -84 + 84 + 3x = 81 + 84 Combine like terms: -84 + 84 = 0 0 + 3x = 81 + 84 3x = 81 + 84 Combine like terms: 81 + 84 = 165 3x = 165 Divide each side by '3'. x = 55 Simplifying x = 55
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