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Simplifying x + -21 = 2x + 3 Reorder the terms: -21 + x = 2x + 3 Reorder the terms: -21 + x = 3 + 2x Solving -21 + x = 3 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -21 + x + -2x = 3 + 2x + -2x Combine like terms: x + -2x = -1x -21 + -1x = 3 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + -1x = 3 + 0 -21 + -1x = 3 Add '21' to each side of the equation. -21 + 21 + -1x = 3 + 21 Combine like terms: -21 + 21 = 0 0 + -1x = 3 + 21 -1x = 3 + 21 Combine like terms: 3 + 21 = 24 -1x = 24 Divide each side by '-1'. x = -24 Simplifying x = -24
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