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Simplifying -5x + 21 + 7x + 21 = -2 Reorder the terms: 21 + 21 + -5x + 7x = -2 Combine like terms: 21 + 21 = 42 42 + -5x + 7x = -2 Combine like terms: -5x + 7x = 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 = -44 2x = -44 Divide each side by '2'. x = -22 Simplifying x = -22
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