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Simplifying 3x = 7(8x + 21) Reorder the terms: 3x = 7(21 + 8x) 3x = (21 * 7 + 8x * 7) 3x = (147 + 56x) Solving 3x = 147 + 56x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-56x' to each side of the equation. 3x + -56x = 147 + 56x + -56x Combine like terms: 3x + -56x = -53x -53x = 147 + 56x + -56x Combine like terms: 56x + -56x = 0 -53x = 147 + 0 -53x = 147 Divide each side by '-53'. x = -2.773584906 Simplifying x = -2.773584906
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