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Simplifying -6x + 21 = 3(x + 7) Reorder the terms: 21 + -6x = 3(x + 7) Reorder the terms: 21 + -6x = 3(7 + x) 21 + -6x = (7 * 3 + x * 3) 21 + -6x = (21 + 3x) Add '-21' to each side of the equation. 21 + -21 + -6x = 21 + -21 + 3x Combine like terms: 21 + -21 = 0 0 + -6x = 21 + -21 + 3x -6x = 21 + -21 + 3x Combine like terms: 21 + -21 = 0 -6x = 0 + 3x -6x = 3x Solving -6x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -6x + -3x = 3x + -3x Combine like terms: -6x + -3x = -9x -9x = 3x + -3x Combine like terms: 3x + -3x = 0 -9x = 0 Divide each side by '-9'. x = 0 Simplifying x = 0
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