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Simplifying -1x + 21 + 3x + 21 = 2 Reorder the terms: 21 + 21 + -1x + 3x = 2 Combine like terms: 21 + 21 = 42 42 + -1x + 3x = 2 Combine like terms: -1x + 3x = 2x 42 + 2x = 2 Solving 42 + 2x = 2 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-42' to each side of the equation. 42 + -42 + 2x = 2 + -42 Combine like terms: 42 + -42 = 0 0 + 2x = 2 + -42 2x = 2 + -42 Combine like terms: 2 + -42 = -40 2x = -40 Divide each side by '2'. x = -20 Simplifying x = -20
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