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Simplifying 7x + 21 = 3x + 9 Reorder the terms: 21 + 7x = 3x + 9 Reorder the terms: 21 + 7x = 9 + 3x Solving 21 + 7x = 9 + 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. 21 + 7x + -3x = 9 + 3x + -3x Combine like terms: 7x + -3x = 4x 21 + 4x = 9 + 3x + -3x Combine like terms: 3x + -3x = 0 21 + 4x = 9 + 0 21 + 4x = 9 Add '-21' to each side of the equation. 21 + -21 + 4x = 9 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 9 + -21 4x = 9 + -21 Combine like terms: 9 + -21 = -12 4x = -12 Divide each side by '4'. x = -3 Simplifying x = -3
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