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Simplifying -1(3x + -12) + 4(5x + 7) = 0 Reorder the terms: -1(-12 + 3x) + 4(5x + 7) = 0 (-12 * -1 + 3x * -1) + 4(5x + 7) = 0 (12 + -3x) + 4(5x + 7) = 0 Reorder the terms: 12 + -3x + 4(7 + 5x) = 0 12 + -3x + (7 * 4 + 5x * 4) = 0 12 + -3x + (28 + 20x) = 0 Reorder the terms: 12 + 28 + -3x + 20x = 0 Combine like terms: 12 + 28 = 40 40 + -3x + 20x = 0 Combine like terms: -3x + 20x = 17x 40 + 17x = 0 Solving 40 + 17x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-40' to each side of the equation. 40 + -40 + 17x = 0 + -40 Combine like terms: 40 + -40 = 0 0 + 17x = 0 + -40 17x = 0 + -40 Combine like terms: 0 + -40 = -40 17x = -40 Divide each side by '17'. x = -2.352941176 Simplifying x = -2.352941176
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