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Simplifying 5x + -1 + 7x = 71 Reorder the terms: -1 + 5x + 7x = 71 Combine like terms: 5x + 7x = 12x -1 + 12x = 71 Solving -1 + 12x = 71 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + 12x = 71 + 1 Combine like terms: -1 + 1 = 0 0 + 12x = 71 + 1 12x = 71 + 1 Combine like terms: 71 + 1 = 72 12x = 72 Divide each side by '12'. x = 6 Simplifying x = 6
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