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Simplifying 3x + -21 = 20 + 2x Reorder the terms: -21 + 3x = 20 + 2x Solving -21 + 3x = 20 + 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 + 3x + -2x = 20 + 2x + -2x Combine like terms: 3x + -2x = 1x -21 + 1x = 20 + 2x + -2x Combine like terms: 2x + -2x = 0 -21 + 1x = 20 + 0 -21 + 1x = 20 Add '21' to each side of the equation. -21 + 21 + 1x = 20 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = 20 + 21 1x = 20 + 21 Combine like terms: 20 + 21 = 41 1x = 41 Divide each side by '1'. x = 41 Simplifying x = 41
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