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Simplifying 12x + -21 + 45x + -81 = -54 Reorder the terms: -21 + -81 + 12x + 45x = -54 Combine like terms: -21 + -81 = -102 -102 + 12x + 45x = -54 Combine like terms: 12x + 45x = 57x -102 + 57x = -54 Solving -102 + 57x = -54 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '102' to each side of the equation. -102 + 102 + 57x = -54 + 102 Combine like terms: -102 + 102 = 0 0 + 57x = -54 + 102 57x = -54 + 102 Combine like terms: -54 + 102 = 48 57x = 48 Divide each side by '57'. x = 0.8421052632 Simplifying x = 0.8421052632
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