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Simplifying 2x + -3x + 1 = 21 Reorder the terms: 1 + 2x + -3x = 21 Combine like terms: 2x + -3x = -1x 1 + -1x = 21 Solving 1 + -1x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + -1x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + -1x = 21 + -1 -1x = 21 + -1 Combine like terms: 21 + -1 = 20 -1x = 20 Divide each side by '-1'. x = -20 Simplifying x = -20
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