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Simplifying 21 + x = -3x + 29 Reorder the terms: 21 + x = 29 + -3x Solving 21 + x = 29 + -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 + x + 3x = 29 + -3x + 3x Combine like terms: x + 3x = 4x 21 + 4x = 29 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 4x = 29 + 0 21 + 4x = 29 Add '-21' to each side of the equation. 21 + -21 + 4x = 29 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 29 + -21 4x = 29 + -21 Combine like terms: 29 + -21 = 8 4x = 8 Divide each side by '4'. x = 2 Simplifying x = 2
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