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Simplifying 2x + 21 = x + 18 Reorder the terms: 21 + 2x = x + 18 Reorder the terms: 21 + 2x = 18 + x Solving 21 + 2x = 18 + 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. 21 + 2x + -1x = 18 + x + -1x Combine like terms: 2x + -1x = 1x 21 + 1x = 18 + x + -1x Combine like terms: x + -1x = 0 21 + 1x = 18 + 0 21 + 1x = 18 Add '-21' to each side of the equation. 21 + -21 + 1x = 18 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 18 + -21 1x = 18 + -21 Combine like terms: 18 + -21 = -3 1x = -3 Divide each side by '1'. x = -3 Simplifying x = -3
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