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Simplifying 2x + 21 = 3 + -1x Reorder the terms: 21 + 2x = 3 + -1x Solving 21 + 2x = 3 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 21 + 2x + x = 3 + -1x + x Combine like terms: 2x + x = 3x 21 + 3x = 3 + -1x + x Combine like terms: -1x + x = 0 21 + 3x = 3 + 0 21 + 3x = 3 Add '-21' to each side of the equation. 21 + -21 + 3x = 3 + -21 Combine like terms: 21 + -21 = 0 0 + 3x = 3 + -21 3x = 3 + -21 Combine like terms: 3 + -21 = -18 3x = -18 Divide each side by '3'. x = -6 Simplifying x = -6
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