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Simplifying 21 = x + 5 + -5x Reorder the terms: 21 = 5 + x + -5x Combine like terms: x + -5x = -4x 21 = 5 + -4x Solving 21 = 5 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 21 + 4x = 5 + -4x + 4x Combine like terms: -4x + 4x = 0 21 + 4x = 5 + 0 21 + 4x = 5 Add '-21' to each side of the equation. 21 + -21 + 4x = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 4x = 5 + -21 4x = 5 + -21 Combine like terms: 5 + -21 = -16 4x = -16 Divide each side by '4'. x = -4 Simplifying x = -4
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