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Simplifying 3x + 8 = x + 21 Reorder the terms: 8 + 3x = x + 21 Reorder the terms: 8 + 3x = 21 + x Solving 8 + 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. 8 + 3x + -1x = 21 + x + -1x Combine like terms: 3x + -1x = 2x 8 + 2x = 21 + x + -1x Combine like terms: x + -1x = 0 8 + 2x = 21 + 0 8 + 2x = 21 Add '-8' to each side of the equation. 8 + -8 + 2x = 21 + -8 Combine like terms: 8 + -8 = 0 0 + 2x = 21 + -8 2x = 21 + -8 Combine like terms: 21 + -8 = 13 2x = 13 Divide each side by '2'. x = 6.5 Simplifying x = 6.5
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