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Simplifying 9x + 21 + -7x + 21 = -4 Reorder the terms: 21 + 21 + 9x + -7x = -4 Combine like terms: 21 + 21 = 42 42 + 9x + -7x = -4 Combine like terms: 9x + -7x = 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 = -46 2x = -46 Divide each side by '2'. x = -23 Simplifying x = -23
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