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Simplifying x + 21 = 43 + -3x Reorder the terms: 21 + x = 43 + -3x Solving 21 + x = 43 + -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 = 43 + -3x + 3x Combine like terms: x + 3x = 4x 21 + 4x = 43 + -3x + 3x Combine like terms: -3x + 3x = 0 21 + 4x = 43 + 0 21 + 4x = 43 Add '-21' to each side of the equation. 21 + -21 + 4x = 43 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 43 + -21 4x = 43 + -21 Combine like terms: 43 + -21 = 22 4x = 22 Divide each side by '4'. x = 5.5 Simplifying x = 5.5
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