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Simplifying 3(7x + 42) = 63 Reorder the terms: 3(42 + 7x) = 63 (42 * 3 + 7x * 3) = 63 (126 + 21x) = 63 Solving 126 + 21x = 63 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-126' to each side of the equation. 126 + -126 + 21x = 63 + -126 Combine like terms: 126 + -126 = 0 0 + 21x = 63 + -126 21x = 63 + -126 Combine like terms: 63 + -126 = -63 21x = -63 Divide each side by '21'. x = -3 Simplifying x = -3
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