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Simplifying 12 + 7x + -1(4x + -1) = 0 Reorder the terms: 12 + 7x + -1(-1 + 4x) = 0 12 + 7x + (-1 * -1 + 4x * -1) = 0 12 + 7x + (1 + -4x) = 0 Reorder the terms: 12 + 1 + 7x + -4x = 0 Combine like terms: 12 + 1 = 13 13 + 7x + -4x = 0 Combine like terms: 7x + -4x = 3x 13 + 3x = 0 Solving 13 + 3x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 3x = 0 + -13 Combine like terms: 13 + -13 = 0 0 + 3x = 0 + -13 3x = 0 + -13 Combine like terms: 0 + -13 = -13 3x = -13 Divide each side by '3'. x = -4.333333333 Simplifying x = -4.333333333
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