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Simplifying x + -2 + 3x + 8 = 21 Reorder the terms: -2 + 8 + x + 3x = 21 Combine like terms: -2 + 8 = 6 6 + x + 3x = 21 Combine like terms: x + 3x = 4x 6 + 4x = 21 Solving 6 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 4x = 21 + -6 Combine like terms: 6 + -6 = 0 0 + 4x = 21 + -6 4x = 21 + -6 Combine like terms: 21 + -6 = 15 4x = 15 Divide each side by '4'. x = 3.75 Simplifying x = 3.75
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