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Simplifying 12x + -1(7x + -1) = 66 Reorder the terms: 12x + -1(-1 + 7x) = 66 12x + (-1 * -1 + 7x * -1) = 66 12x + (1 + -7x) = 66 Reorder the terms: 1 + 12x + -7x = 66 Combine like terms: 12x + -7x = 5x 1 + 5x = 66 Solving 1 + 5x = 66 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 + 5x = 66 + -1 Combine like terms: 1 + -1 = 0 0 + 5x = 66 + -1 5x = 66 + -1 Combine like terms: 66 + -1 = 65 5x = 65 Divide each side by '5'. x = 13 Simplifying x = 13
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