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Simplifying 3x + 21 = 2x + 40 Reorder the terms: 21 + 3x = 2x + 40 Reorder the terms: 21 + 3x = 40 + 2x Solving 21 + 3x = 40 + 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 = 40 + 2x + -2x Combine like terms: 3x + -2x = 1x 21 + 1x = 40 + 2x + -2x Combine like terms: 2x + -2x = 0 21 + 1x = 40 + 0 21 + 1x = 40 Add '-21' to each side of the equation. 21 + -21 + 1x = 40 + -21 Combine like terms: 21 + -21 = 0 0 + 1x = 40 + -21 1x = 40 + -21 Combine like terms: 40 + -21 = 19 1x = 19 Divide each side by '1'. x = 19 Simplifying x = 19
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