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Simplifying -7x + 3[x + -7(3 + -3x)] = 0 -7x + 3[x + (3 * -7 + -3x * -7)] = 0 -7x + 3[x + (-21 + 21x)] = 0 Reorder the terms: -7x + 3[-21 + x + 21x] = 0 Combine like terms: x + 21x = 22x -7x + 3[-21 + 22x] = 0 -7x + [-21 * 3 + 22x * 3] = 0 -7x + [-63 + 66x] = 0 Reorder the terms: -63 + -7x + 66x = 0 Combine like terms: -7x + 66x = 59x -63 + 59x = 0 Solving -63 + 59x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '63' to each side of the equation. -63 + 63 + 59x = 0 + 63 Combine like terms: -63 + 63 = 0 0 + 59x = 0 + 63 59x = 0 + 63 Combine like terms: 0 + 63 = 63 59x = 63 Divide each side by '59'. x = 1.06779661 Simplifying x = 1.06779661
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