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Simplifying 3x + -21 + 4x = 15 Reorder the terms: -21 + 3x + 4x = 15 Combine like terms: 3x + 4x = 7x -21 + 7x = 15 Solving -21 + 7x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 7x = 15 + 21 Combine like terms: -21 + 21 = 0 0 + 7x = 15 + 21 7x = 15 + 21 Combine like terms: 15 + 21 = 36 7x = 36 Divide each side by '7'. x = 5.142857143 Simplifying x = 5.142857143
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