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Simplifying 3x + 25 = x + 21 Reorder the terms: 25 + 3x = x + 21 Reorder the terms: 25 + 3x = 21 + x Solving 25 + 3x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 25 + 3x + -1x = 21 + x + -1x Combine like terms: 3x + -1x = 2x 25 + 2x = 21 + x + -1x Combine like terms: x + -1x = 0 25 + 2x = 21 + 0 25 + 2x = 21 Add '-25' to each side of the equation. 25 + -25 + 2x = 21 + -25 Combine like terms: 25 + -25 = 0 0 + 2x = 21 + -25 2x = 21 + -25 Combine like terms: 21 + -25 = -4 2x = -4 Divide each side by '2'. x = -2 Simplifying x = -2
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