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Simplifying 9[3 + -1(3x + -7)] + 7x = 0 Reorder the terms: 9[3 + -1(-7 + 3x)] + 7x = 0 9[3 + (-7 * -1 + 3x * -1)] + 7x = 0 9[3 + (7 + -3x)] + 7x = 0 Combine like terms: 3 + 7 = 10 9[10 + -3x] + 7x = 0 [10 * 9 + -3x * 9] + 7x = 0 [90 + -27x] + 7x = 0 Combine like terms: -27x + 7x = -20x 90 + -20x = 0 Solving 90 + -20x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-90' to each side of the equation. 90 + -90 + -20x = 0 + -90 Combine like terms: 90 + -90 = 0 0 + -20x = 0 + -90 -20x = 0 + -90 Combine like terms: 0 + -90 = -90 -20x = -90 Divide each side by '-20'. x = 4.5 Simplifying x = 4.5
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