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Simplifying 2x + -3 = 21 + x Reorder the terms: -3 + 2x = 21 + x Solving -3 + 2x = 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. -3 + 2x + -1x = 21 + x + -1x Combine like terms: 2x + -1x = 1x -3 + 1x = 21 + x + -1x Combine like terms: x + -1x = 0 -3 + 1x = 21 + 0 -3 + 1x = 21 Add '3' to each side of the equation. -3 + 3 + 1x = 21 + 3 Combine like terms: -3 + 3 = 0 0 + 1x = 21 + 3 1x = 21 + 3 Combine like terms: 21 + 3 = 24 1x = 24 Divide each side by '1'. x = 24 Simplifying x = 24
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