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Simplifying 7x + -1(1 + -4x) = 12 7x + (1 * -1 + -4x * -1) = 12 7x + (-1 + 4x) = 12 Reorder the terms: -1 + 7x + 4x = 12 Combine like terms: 7x + 4x = 11x -1 + 11x = 12 Solving -1 + 11x = 12 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 + 11x = 12 + 1 Combine like terms: -1 + 1 = 0 0 + 11x = 12 + 1 11x = 12 + 1 Combine like terms: 12 + 1 = 13 11x = 13 Divide each side by '11'. x = 1.181818182 Simplifying x = 1.181818182
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