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Simplifying 5x + -7 + 7x + -23 = 66 Reorder the terms: -7 + -23 + 5x + 7x = 66 Combine like terms: -7 + -23 = -30 -30 + 5x + 7x = 66 Combine like terms: 5x + 7x = 12x -30 + 12x = 66 Solving -30 + 12x = 66 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + 12x = 66 + 30 Combine like terms: -30 + 30 = 0 0 + 12x = 66 + 30 12x = 66 + 30 Combine like terms: 66 + 30 = 96 12x = 96 Divide each side by '12'. x = 8 Simplifying x = 8
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