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Simplifying 7x + 21 + -5x + 21 = 4 Reorder the terms: 21 + 21 + 7x + -5x = 4 Combine like terms: 21 + 21 = 42 42 + 7x + -5x = 4 Combine like terms: 7x + -5x = 2x 42 + 2x = 4 Solving 42 + 2x = 4 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 = 4 + -42 Combine like terms: 42 + -42 = 0 0 + 2x = 4 + -42 2x = 4 + -42 Combine like terms: 4 + -42 = -38 2x = -38 Divide each side by '2'. x = -19 Simplifying x = -19
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