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Simplifying 7x + 7[2x + -9] = 63 Reorder the terms: 7x + 7[-9 + 2x] = 63 7x + [-9 * 7 + 2x * 7] = 63 7x + [-63 + 14x] = 63 Reorder the terms: -63 + 7x + 14x = 63 Combine like terms: 7x + 14x = 21x -63 + 21x = 63 Solving -63 + 21x = 63 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 + 21x = 63 + 63 Combine like terms: -63 + 63 = 0 0 + 21x = 63 + 63 21x = 63 + 63 Combine like terms: 63 + 63 = 126 21x = 126 Divide each side by '21'. x = 6 Simplifying x = 6
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