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Simplifying 2x + 5x + 21 + 15 = 0 Reorder the terms: 21 + 15 + 2x + 5x = 0 Combine like terms: 21 + 15 = 36 36 + 2x + 5x = 0 Combine like terms: 2x + 5x = 7x 36 + 7x = 0 Solving 36 + 7x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 7x = 0 + -36 Combine like terms: 36 + -36 = 0 0 + 7x = 0 + -36 7x = 0 + -36 Combine like terms: 0 + -36 = -36 7x = -36 Divide each side by '7'. x = -5.142857143 Simplifying x = -5.142857143
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