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Simplifying -7x + 21 + 4x = 21 + 3x Reorder the terms: 21 + -7x + 4x = 21 + 3x Combine like terms: -7x + 4x = -3x 21 + -3x = 21 + 3x Add '-21' to each side of the equation. 21 + -21 + -3x = 21 + -21 + 3x Combine like terms: 21 + -21 = 0 0 + -3x = 21 + -21 + 3x -3x = 21 + -21 + 3x Combine like terms: 21 + -21 = 0 -3x = 0 + 3x -3x = 3x Solving -3x = 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. -3x + -3x = 3x + -3x Combine like terms: -3x + -3x = -6x -6x = 3x + -3x Combine like terms: 3x + -3x = 0 -6x = 0 Divide each side by '-6'. x = 0 Simplifying x = 0
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