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Simplifying 3x + 21 + -4x = 40 Reorder the terms: 21 + 3x + -4x = 40 Combine like terms: 3x + -4x = -1x 21 + -1x = 40 Solving 21 + -1x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. 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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